UI: Add Audio bitrate

CoreAudio AAC encoder is now available for both AAC-LC and HE-AAC.
Added some Audio bitrate settings for lower bitrate region.

obs/forms/OBSBasicSettings.ui

@@ -460,23 +460,38 @@
                    <item row="3" column="1">
                     <widget class="QComboBox" name="simpleOutputABitrate">
                      <property name="currentIndex">
-                      <number>4</number>
+                      <number>8</number>
                      </property>
                      <item>
                       <property name="text">
                        <string>32</string>
                       </property>
                      </item>
+                     <item>
+                      <property name="text">
+                       <string>48</string>
+                      </property>
+                     </item>
                      <item>
                       <property name="text">
                        <string>64</string>
                       </property>
                      </item>
+                     <item>
+                      <property name="text">
+                       <string>80</string>
+                      </property>
+                     </item>
                      <item>
                       <property name="text">
                        <string>96</string>
                       </property>
                      </item>
+                     <item>
+                      <property name="text">
+                       <string>112</string>
+                      </property>
+                     </item>
                      <item>
                       <property name="text">
                        <string>128</string>
@@ -1569,23 +1584,38 @@
                        <item row="0" column="1">
                         <widget class="QComboBox" name="advOutTrack1Bitrate">
                          <property name="currentIndex">
-                          <number>4</number>
+                          <number>8</number>
                          </property>
                          <item>
                           <property name="text">
                            <string>32</string>
                           </property>
                          </item>
+                         <item>
+                          <property name="text">
+                           <string>48</string>
+                          </property>
+                         </item>
                          <item>
                           <property name="text">
                            <string>64</string>
                           </property>
                          </item>
+                         <item>
+                          <property name="text">
+                           <string>80</string>
+                          </property>
+                         </item>
                          <item>
                           <property name="text">
                            <string>96</string>
                           </property>
                          </item>
+                         <item>
+                          <property name="text">
+                           <string>112</string>
+                          </property>
+                         </item>
                          <item>
                           <property name="text">
                            <string>128</string>
@@ -1679,23 +1709,38 @@
                        <item row="0" column="1">
                         <widget class="QComboBox" name="advOutTrack2Bitrate">
                          <property name="currentIndex">
-                          <number>4</number>
+                          <number>8</number>
                          </property>
                          <item>
                           <property name="text">
                            <string>32</string>
                           </property>
                          </item>
+                         <item>
+                          <property name="text">
+                           <string>48</string>
+                          </property>
+                         </item>
                          <item>
                           <property name="text">
                            <string>64</string>
                           </property>
                          </item>
+                         <item>
+                          <property name="text">
+                           <string>80</string>
+                          </property>
+                         </item>
                          <item>
                           <property name="text">
                            <string>96</string>
                           </property>
                          </item>
+                         <item>
+                          <property name="text">
+                           <string>112</string>
+                          </property>
+                         </item>
                          <item>
                           <property name="text">
                            <string>128</string>
@@ -1773,23 +1818,38 @@
                        <item row="0" column="1">
                         <widget class="QComboBox" name="advOutTrack3Bitrate">
                          <property name="currentIndex">
-                          <number>4</number>
+                          <number>8</number>
                          </property>
                          <item>
                           <property name="text">
                            <string>32</string>
                           </property>
                          </item>
+                         <item>
+                          <property name="text">
+                           <string>48</string>
+                          </property>
+                         </item>
                          <item>
                           <property name="text">
                            <string>64</string>
                           </property>
                          </item>
+                         <item>
+                          <property name="text">
+                           <string>80</string>
+                          </property>
+                         </item>
                          <item>
                           <property name="text">
                            <string>96</string>
                           </property>
                          </item>
+                         <item>
+                          <property name="text">
+                           <string>112</string>
+                          </property>
+                         </item>
                          <item>
                           <property name="text">
                            <string>128</string>
@@ -1867,23 +1927,38 @@
                        <item row="0" column="1">
                         <widget class="QComboBox" name="advOutTrack4Bitrate">
                          <property name="currentIndex">
-                          <number>4</number>
+                          <number>8</number>
                          </property>
                          <item>
                           <property name="text">
                            <string>32</string>
                           </property>
                          </item>
+                         <item>
+                          <property name="text">
+                           <string>48</string>
+                          </property>
+                         </item>
                          <item>
                           <property name="text">
                            <string>64</string>
                           </property>
                          </item>
+                         <item>
+                          <property name="text">
+                           <string>80</string>
+                          </property>
+                         </item>
                          <item>
                           <property name="text">
                            <string>96</string>
                           </property>
                          </item>
+                         <item>
+                          <property name="text">
+                           <string>112</string>
+                          </property>
+                         </item>
                          <item>
                           <property name="text">
                            <string>128</string>