Shield behavior now provides protection from damage at the expense of heat and energy usage
Weapon scripts check for the presence of a shield when detecting collisions (TODO: TEST ALL WEAPON TYPES)
Shields can be toggled on/off (G key)
Database cache now included in repo (saves some confusion)
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