Switch ambientglow+brightmap shader to actually use brightmap textures directly. This bumps the version requirement to 3.5.0 and makes it sorta-possible to play with software rendering without seeing "invisible pickup models".
Re-ran all textures through optipng.
All add-ons have been updated accordingly.
Added water step/land sounds.
Made footsteps toggleable (in case the player is using another mod that adds them).
Added handling of liquid terrain on all actors that need it.
Fixed dual enforcers breaking after level transition.
Fixed some refire issues caused by the use of the Resurrect cheat.
Made guided redeemer missiles explode on player death.
Replaced pure particles on pulse gun effects with actor particles.
