Either fix up or abandon the runtime game UI module

[fkelava]

Runtime has from early on possessed a very rudimentary game UI module that more or less existed to render Fahrenheit v1.0.0.0 using TOMkpCrossExtMesFontLClutTypeRGBA. While convenient and a good early example of module structure, it has fallen into disuse and is currently stubbed out almost entirely in mainline.

It should be decided what to do with it. Either:

• it shall be excised entirely
• we will take the time to expand it with a number of TO* function calls and present a unified 'game UI' toolkit with appropriate Core API.

Not urgent, but a question to settle for 1.0.

[EvelynTSMG]

To expand, we need to figure out exactly where it's valid to use those calls.
The current hook in Runtime that invokes render_game for all modules was placed at the first place it worked, without enough research to solidify its place for 1.0.