Class selection UI improvements — Throne Requiem Steam update #837715

The class selection screen has been changed to be more direct with having a better menu UI for selecting classes, and showing what a class's description is with less inputs required. It is also much more universal, meaning it's easier to add and edit anything with selecting classes, meaning it's much easier to add more classes if I choose to in the future. It also means less work when the localization plans get into effect. There are some slight background improvements to food timers before it becomes rotten, which should make it run slightly better than before.