obs-ffmpeg: Rename and add more VAAPI levels

The Auto level lets the encoder decide which level to use.
Furthermore, some devices allow levels beyond 4.2. Therefore,
we add all levels allowed by H.264. This is of importance,
since using a resolution not supported by the specified level
can trigger undefined behavior on the hardware/kernel.

plugins/obs-ffmpeg/obs-ffmpeg-vaapi.c

@@ -561,12 +561,16 @@ static obs_properties_t *vaapi_properties(void *unused)
 	list = obs_properties_add_list(props, "level", "Level",
 				       OBS_COMBO_TYPE_LIST,
 				       OBS_COMBO_FORMAT_INT);
-	obs_property_list_add_int(list, "480p30 (3.0)", 30);
-	obs_property_list_add_int(list, "720p30/480p60  (3.1)", 31);
-	obs_property_list_add_int(list, "Compatibility mode  (4.0 default)",
+	obs_property_list_add_int(list, "Auto", FF_LEVEL_UNKNOWN);
+	obs_property_list_add_int(list, "3.0", 30);
+	obs_property_list_add_int(list, "3.1", 31);
+	obs_property_list_add_int(list, "4.0 (default) (Compatibility mode)",
 				  40);
-	obs_property_list_add_int(list, "720p60/1080p30 (4.1)", 41);
-	obs_property_list_add_int(list, "1080p60 (4.2)", 42);
+	obs_property_list_add_int(list, "4.1", 41);
+	obs_property_list_add_int(list, "4.2", 42);
+	obs_property_list_add_int(list, "5.0", 50);
+	obs_property_list_add_int(list, "5.1", 51);
+	obs_property_list_add_int(list, "5.2", 52);
 
 	list = obs_properties_add_list(props, "rate_control",
 				       obs_module_text("RateControl"),