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

servers/rendering/rendering_server_scene.h

@@ -33,13 +33,13 @@
 
 #include "servers/rendering/rasterizer.h"
 
-#include "core/local_vector.h"
 #include "core/math/geometry_3d.h"
 #include "core/math/octree.h"
 #include "core/os/semaphore.h"
 #include "core/os/thread.h"
-#include "core/rid_owner.h"
-#include "core/self_list.h"
+#include "core/templates/local_vector.h"
+#include "core/templates/rid_owner.h"
+#include "core/templates/self_list.h"
 #include "servers/xr/xr_interface.h"
 
 class RenderingServerScene {