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

core/input/input_map.cpp

@@ -30,8 +30,8 @@
 
 #include "input_map.h"
 
+#include "core/config/project_settings.h"
 #include "core/os/keyboard.h"
-#include "core/project_settings.h"
 
 InputMap *InputMap::singleton = nullptr;