AvP Remake 2022 08 29 file

The vents are no longer safe. Added vent alien sprites to the game, along with spawners for each vent. The sounds on them probably aren't right yet, haven't really tested it all, let me know if you find anything. My next task is going to be to dig through the original and see if/what/where other things appear in the vents, the alien spawns in the vent are really just me giving random spaced out spawn points at the moment. Also revamped weapon swapping so its faster and less buggy.