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/api/java_class_wrapper.h

@@ -31,7 +31,7 @@
 #ifndef JAVA_CLASS_WRAPPER_H
 #define JAVA_CLASS_WRAPPER_H
 
-#include "core/reference.h"
+#include "core/object/reference.h"
 
 #ifdef ANDROID_ENABLED
 #include <android/log.h>