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

drivers/coremidi/midi_driver_coremidi.cpp

@@ -32,7 +32,7 @@
 
 #include "midi_driver_coremidi.h"
 
-#include "core/print_string.h"
+#include "core/string/print_string.h"
 
 #include <CoreAudio/HostTime.h>
 #include <CoreServices/CoreServices.h>

drivers/coremidi/midi_driver_coremidi.h

@@ -34,7 +34,7 @@
 #define MIDI_DRIVER_COREMIDI_H
 
 #include "core/os/midi_driver.h"
-#include "core/vector.h"
+#include "core/templates/vector.h"
 
 #include <CoreMIDI/CoreMIDI.h>
 #include <stdio.h>