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

platform/android/display_server_android.cpp

@@ -31,7 +31,7 @@
 #include "display_server_android.h"
 
 #include "android_keys_utils.h"
-#include "core/project_settings.h"
+#include "core/config/project_settings.h"
 #include "java_godot_io_wrapper.h"
 #include "java_godot_wrapper.h"
 #include "os_android.h"