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

editor/localization_editor.h

@@ -31,7 +31,7 @@
 #ifndef LOCALIZATION_EDITOR_H
 #define LOCALIZATION_EDITOR_H
 
-#include "core/undo_redo.h"
+#include "core/object/undo_redo.h"
 #include "editor_file_dialog.h"
 #include "scene/gui/tree.h"