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

thirdparty/misc/triangulator.h

@@ -21,9 +21,9 @@
 #ifndef TRIANGULATOR_H
 #define TRIANGULATOR_H
 
-#include "core/list.h"
+#include "core/templates/list.h"
 #include "core/math/vector2.h"
-#include "core/set.h"
+#include "core/templates/set.h"
 
 //2D point structure