Fixed the annoying recurring missing spawn icon bug. -_-

Fixed the missing spawn icon texture bug due to an invalid folder name

Attempt to fix a bug where non-admin users could not give themselves the Spamgun

Fixed a bug with the uploaded addon, which seems to have been bugged by my upload software.

Fixed a bug where the spawnmenu entry would show a missing texture.

Fixed a bug where two spamguns appeared in the spawnmenu

Added console variables enable_prop_lifespan and prop_lifespan to the server console; enable_prop_lifespan sets prop lifespans on or off, and prop_lifespan sets how long (in seconds) a prop will continue to exist.