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/javascript/api/javascript_tools_editor_plugin.cpp

@@ -31,10 +31,10 @@
 #if defined(TOOLS_ENABLED) && defined(JAVASCRIPT_ENABLED)
 #include "javascript_tools_editor_plugin.h"
 
-#include "core/engine.h"
+#include "core/config/engine.h"
+#include "core/config/project_settings.h"
 #include "core/os/dir_access.h"
 #include "core/os/file_access.h"
-#include "core/project_settings.h"
 #include "editor/editor_node.h"
 
 #include <emscripten/emscripten.h>