Added Source:clone() and love.audio.newSource(source): creates a new (stopped) Source which has all of the settable state of the original.

Static sources don’t duplicate their OpenAL data buffer when cloned (resolves issue #319). Cloned streaming sources also clone the original Decoder.

src/modules/audio/wrap_Source.h

@@ -30,6 +30,7 @@ namespace audio
 {
 
 Source *luax_checksource(lua_State *L, int idx);
+int w_Source_clone(lua_State *L);
 int w_Source_play(lua_State *L);
 int w_Source_stop(lua_State *L);
 int w_Source_pause(lua_State *L);