0.8.9.6 - DebugUI spruce-up

Improved the debug UI panel with better contrast for categories, a background panel, and tooltips (tooltip text WIP!)

Some balancing tweaks here and there.

A way to view and edit the curves for certain categories is in progress. I can currently render any curve with domain 0.0 - 1.0, but there's several curves that have custom domain. Those might be too technical to just play around with in game.