Replaced godframe glows approach with rendermode/color approach; removed (now unused) boom tracking and unused macros/clutter

Been testing this approach in Random 1.1 games for a good long while now. I'm pretty happy with it. It's simple, it's informative, it doesn't clash with the game's glows or require hacks/tweaks to keep the game's rendering of survivors/glows intact.

Plus, this way the plugin becomes smaller/cleaner.