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/io/resource_format_binary.cpp

@@ -30,11 +30,11 @@
 
 #include "resource_format_binary.h"
 
-#include "core/image.h"
+#include "core/config/project_settings.h"
 #include "core/io/file_access_compressed.h"
+#include "core/io/image.h"
 #include "core/io/marshalls.h"
 #include "core/os/dir_access.h"
-#include "core/project_settings.h"
 #include "core/version.h"
 
 //#define print_bl(m_what) print_line(m_what)