Tons of QoL fixes for Kettuloch!

This update brings a ton of improvements, almost all of which were written by LynxSnowCat. The map has walls, the sidebar has contextual buttons, and the footer can display all of its contents onscreen at once (on desktop), all thanks to them!

Plus, I've fixed a few things (including the bug that would occur when fighting and transforming at the same time) and in the near future (hopefully tomorrow) I'll add a few more secret things to find.