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/import/editor_import_plugin.cpp

@@ -29,7 +29,7 @@
 /*************************************************************************/
 
 #include "editor_import_plugin.h"
-#include "core/script_language.h"
+#include "core/object/script_language.h"
 
 EditorImportPlugin::EditorImportPlugin() {
 }