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

modules/visual_script/visual_script_flow_control.cpp

@@ -30,9 +30,9 @@
 
 #include "visual_script_flow_control.h"
 
+#include "core/config/project_settings.h"
 #include "core/io/resource_loader.h"
 #include "core/os/keyboard.h"
-#include "core/project_settings.h"
 
 //////////////////////////////////////////
 ////////////////RETURN////////////////////