Add RoomnameTranslator.cpp/h (not compiled yet)

This commit is part of rewritten history of the localization branch.
The original (unsquashed) commit history can be found here:
https://github.com/Dav999-v/VVVVVV/tree/localization-orig

desktop_version/src/RoomnameTranslator.h

@@ -0,0 +1,20 @@
+#ifndef ROOMNAMETRANSLATOR_H
+#define ROOMNAMETRANSLATOR_H
+
+#include <SDL.h>
+
+namespace roomname_translator
+{
+    extern bool enabled;
+    extern bool edit_mode;
+
+    extern SDL_Surface* dimbuffer;
+    extern SDL_Rect fullscreen_rect;
+
+    void set_enabled(bool value);
+    bool is_pausing(void);
+    void overlay_render(bool* force_roomname_hidden, int* roomname_r, int* roomname_g, int* roomname_b);
+    bool overlay_input(void);
+}
+
+#endif /* ROOMNAMETRANSLATOR_H */