Was a long time coming :V
Nev3r's supported different FOV. I also expanded it to let it support splitscreen's different screen sizes in a better fashion than the old method of just dividing the final coordinates.
The results are also stored in a struct, instead of modifying passed in variables, so it's also less dunderheaded than what I was doing before overall.
- Split HUD stuff into k_hud.c/h
- V_SPLITSCREEN replaces the old function that sets V_SPLITSCREEN/V_HORZSCREEN flags system, and instead automatically moves it based on player number
- V_SLIDEIN makes HUD items slide in after the intro animation.
