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/string/SCsub

@@ -0,0 +1,7 @@
+#!/usr/bin/env python
+
+Import("env")
+
+env_string = env.Clone()
+
+env_string.add_source_files(env.core_sources, "*.cpp")