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/editor_layouts_dialog.cpp

@@ -30,8 +30,8 @@
 
 #include "editor_layouts_dialog.h"
 
-#include "core/class_db.h"
 #include "core/io/config_file.h"
+#include "core/object/class_db.h"
 #include "core/os/keyboard.h"
 #include "editor/editor_settings.h"
 #include "scene/gui/item_list.h"