added a keybind to hold to sprint. thinking that sprinting will actually be the default state, and walking will be separate.

i also bonked around the animator and tested some stuff with the mixamo animations i have, but it looked fine with just the idle, walk, and sprint.

did just a tiny bit of adjustment to how the character slips. i have a lot more in mind for how to handle gravity, grounded states, and moving across slopes. all lessons learned from past 2D projects.

surprised that i found motivation to work on this, today was super busy!