Splash page woes

I just wanted to add a splash page

Instead, it opened up a whole thing about everything. So there ended up being a lot of refactoring and tracking down of obscure bugs in both my code and frameworks.

While I was in there, I also decided to add the ability to dynamically scour sprite directories and create all the sprites I need. This involved reading the PNG headers to find image dimensions, which was new for me. But ultimately, I hope it means I can add new things without having to write a bunch of unique initialization code.