Removing models such as aurora/hatak/deathmaze

Some models are just too stupid for anything but the two purposes of 1: bad cadet builds that probably should not be encouraged and 2: testing titan explosion sfx.

Ways to deal:

sbox_maxdeathmaze(n) - A blacklist for these models that can be toggled on and off (credit Steev)

Normal prop blacklist.

Straight up deleting the models from the server.

(idea brought up by big hero Copper)