Reorganized core/ directory, it was too fatty already

-Removed FuncRef, since Callable makes it obsolete
-Removed int_types.h as its obsolete in c++11+
-Changed color names code

platform/javascript/audio_driver_javascript.cpp

@@ -30,7 +30,7 @@
 
 #include "audio_driver_javascript.h"
 
-#include "core/project_settings.h"
+#include "core/config/project_settings.h"
 #include "godot_audio.h"
 
 #include <emscripten.h>