New buttons graphics, add info about ESC key to battle intro option

Mods/vcmi/Sprites/buttons/quadwide.json

@@ -3,6 +3,8 @@
 	"images" :
 	[
 		{ "frame" : 0, "file" : "quadwide-normal.png"},
-		{ "frame" : 1, "file" : "quadwide-pressed.png"}
+		{ "frame" : 1, "file" : "quadwide-pressed-selected.png"},
+		{ "frame" : 2, "file" : "quadwide-pressed.png"},
+		{ "frame" : 3, "file" : "quadwide-normal-selected.png"},
 	]
 }

Mods/vcmi/Sprites/buttons/square.json

@@ -3,6 +3,8 @@
 	"images" :
 	[
 		{ "frame" : 0, "file" : "square-normal.png"},
-		{ "frame" : 1, "file" : "square-pressed.png"}
+		{ "frame" : 1, "file" : "square-pressed-selected.png"}
+		{ "frame" : 2, "file" : "square-pressed.png"},
+		{ "frame" : 3, "file" : "square-normal-selected.png"}
 	]
 }

Mods/vcmi/Sprites/buttons/triplewide.json

@@ -3,6 +3,8 @@
 	"images" :
 	[
 		{ "frame" : 0, "file" : "triplewide-normal.png"},
-		{ "frame" : 1, "file" : "triplewide-pressed.png"}
+		{ "frame" : 1, "file" : "triplewide-pressed-selected.png"}
+		{ "frame" : 2, "file" : "triplewide-pressed.png"}
+		{ "frame" : 3, "file" : "triplewide-normal-selected.png"}
 	]
 }

Mods/vcmi/config/vcmi/english.json

@@ -72,7 +72,7 @@
 	"vcmi.battleOptions.animationsSpeed6.hover": "6",
 	"vcmi.battleOptions.animationsSpeed6.help": "Sets animation speed to extremely fast",
 	"vcmi.battleOptions.skipBattleIntroMusic.hover": "Skip intro music",
-	"vcmi.battleOptions.skipBattleIntroMusic.help": "{Skip intro music}\n\n Skip short music that plays at beginning of each battle before action starts.",
+	"vcmi.battleOptions.skipBattleIntroMusic.help": "{Skip intro music}\n\n Skip short music that plays at beginning of each battle before action starts. Can also be skipped by pressing ESC key.",
 
 	"vcmi.otherOptions.availableCreaturesAsDwellingLabel.hover" : "Show available creatures in town summary",
 	"vcmi.otherOptions.availableCreaturesAsDwellingLabel.help" : "{Show available creatures in town summary}\n\n Shows creatures available to purchase instead of their growth in town summary (bottom-left corner).",