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/find_in_files.h

@@ -31,7 +31,7 @@
 #ifndef FIND_IN_FILES_H
 #define FIND_IN_FILES_H
 
-#include "core/hash_map.h"
+#include "core/templates/hash_map.h"
 #include "scene/gui/dialogs.h"
 
 // Performs the actual search