added StopMusic method

Docs/Luadoc/Lua.xml

@@ -716,6 +716,7 @@
 			<Function name='PlayAnnouncer'/>
 			<Function name='PlayMusicPart'/>
 			<Function name='PlayOnce'/>
+			<Function name='StopMusic'/>
 		</Class>
 		<Class name='GameState'>
 			<Function name='AddStageToPlayer'/>

Docs/Luadoc/LuaDocumentation.xml

@@ -2115,6 +2115,9 @@ save yourself some time, copy this for undocumented things:
 	<Function name='PlayOnce' return='void' arguments='string sPath'>
 		Play the sound at <code>sPath</code> one time.
 	</Function>
+	<Function name='StopMusic' return='void' arguments='void'>
+		Stops the music.
+	</Function>
 </Class>
 <Class name='GameState'>
 	<Function name='AddStageToPlayer' return='void' arguments='PlayerNumber pn'>

src/GameSoundManager.cpp

@@ -855,6 +855,8 @@ public:
 		return 0;
 	}
 
+	static int StopMusic( T* p, lua_State *L ) { p->StopMusic(); return 0; }
+	
 	LunaGameSoundManager()
 	{
 		ADD_METHOD( DimMusic );
@@ -862,6 +864,7 @@ public:
 		ADD_METHOD( PlayAnnouncer );
 		ADD_METHOD( GetPlayerBalance );
 		ADD_METHOD( PlayMusicPart );
+		ADD_METHOD( StopMusic );
 	}
 };