Switched to Integer Math

I was planning for the refactoring of the coordinates system to take two full days, and I am already done with it. I needed to move from floats and Vector2’s to my own fixed-point based structs for position and velocity. I’m a huge fan of integers, and now the Soulcaster engine uses them just like Escape Goat.

World coordinates are now independent from pixels, so I can boost the resolution to HD, and even try a few different tile sizes. I still haven’t figured out what the best visible room size is yet. I might have a bit of zoom like EG2, but there should be a max size that fits the whole screen.