Rename love.audio.setMixMode to setMixWithSystem. Fix some copyright notice typos.

--HG--
branch : minor

src/modules/audio/wrap_Audio.cpp

@@ -25,9 +25,6 @@
 #include "null/Audio.h"
 
 #include "common/runtime.h"
-#ifdef LOVE_IOS
-#include "common/ios.h"
-#endif
 
 // C++
 #include <iostream>
@@ -521,15 +518,10 @@ int w_isEffectsSupported(lua_State *L)
 	return 1;
 }
 
-#ifdef LOVE_IOS
-int w_setMixMode(lua_State *L)
+int w_setMixWithSystem(lua_State *L)
 {
-	love::ios::setAudioMixWithOthers(lua_toboolean(L, 1));
-#else
-int w_setMixMode(lua_State *)
-{
-#endif
-	return 0;
+	luax_pushboolean(L, instance()->setMixWithSystem(luax_toboolean(L, 1)));
+	return 1;
 }
 
 // List of functions to wrap.
@@ -562,7 +554,7 @@ static const luaL_Reg functions[] =
 	{ "getMaxSceneEffects", w_getMaxSceneEffects },
 	{ "getMaxSourceEffects", w_getMaxSourceEffects },
 	{ "isEffectsSupported", w_isEffectsSupported },
-	{ "setMixMode", w_setMixMode },
+	{ "setMixWithSystem", w_setMixWithSystem },
 	{ 0, 0 }
 };