Added new clouds shader with improved raymarching loop
Currently only being used in main menu (rest is coming right up!)
Removed WWise (it's nice, but all it's doing is throwing exceptions rn since we ain't about to get a license)
Converted entity materials to new fade shader
Implemented visibility system
Refactored per-instance entity code to run inside monobehavior on entity instances
Created state machine AI for enemy ships with basic patrol and combat routines
Removed legacy AI code (controller item behaviors)
Added automatic trigger group assignment for matched weapons
Created ship collision system
Created shield VFX and colliders
