Small bug fixes and some new assets for fun

I added a new floor texture and skybox, they don't look good but it makes the lighting more interesting I guess.

I fixed some bugs I found in the movement code again.

I am working on smoothing out the netcode to make it visually better. After that I'll start working to make it more fair, reliable, and optimized.

Once that's handled, I'll be working on a lobby system and eventually a map/mode builder so people can create custom modes and level and stuff.