Character animations

[Ragnaroeck22]

Implement a system capable of displaying simple walk cycles using spritesheets.

This system is the basis for all future animation systems (e.g. combat animations) in the game, so the code must be written in a way that allows it to be easily repurposed and/or expanded.

Current state: All functions are finished but may require polishing. There may have to be made some small adjustments when the art team finishes their spritesheets.

[Ragnaroeck22]

Walking and idle animations have been finished