Massive overhaul to automatic gun functionality, intended primarily to
allow partially-filled magazines to be released.

Now it compiles and doesn't throw runtimes! Also chambering rounds works
right! Unfortunately the contents still need to be looked at, the Russian
Revolver isn't working, and the Bartender's shotgun is just a nightmare.
Also you still can't eject mags.

Mags eject, most gun work. Shotguns still have a problem with reloading
and chambering. Russian Revolver is a bitch.

Heavy finalizing touches. Fixed references to changed trees. Added
icon_states for some magazines. Fixed revolver glitches and subtyped
double-barreled shotguns to revolvers to fix its glitches. Made bullets
and spent shells more obvious via graphical changes. Probably did some
other things but I can't think of what they'd be.

Sprite tweaks for final preparations for pull request.

final FINAL finalizations.

Adding full paths to overwritten procs for simplicity's sake.

Fixing damaged .gitignore and config/admins.txt.