Whole bunch of gun-related stuff

- C20r is now .45 since the 12mm snowflake ammo it used did the same damage/stun as .45
- Got rid of 12mm ammo entirely
- Silencers renamed to correct terminology 'suppressors' (not the sound file, though)
- New sprites for .45 ammo boxes and 10mm ammo boxes (Just simple recolors) (previously they were re-using the 9mm box)
- Lots of name and description tweaks **BIG ONE**
- Eguns and tasers now have proper inhand 'empty' two-frame animations with a blinking dot much like the ion rifle, this took a lot of tedious pixel editing so it's likely i missed a pixel or two here so I will do some more passes on looking over these
- Eguns and tasers also have proper item sprites as well, will represent when empty

![kill](https://cloud.githubusercontent.com/assets/7247232/3849828/6b1175a0-1e7d-11e4-8444-5445f22add73.gif) ![stun](https://cloud.githubusercontent.com/assets/7247232/3849829/6c38846e-1e7d-11e4-90ba-4d0e9d793efd.gif) ![tase](https://cloud.githubusercontent.com/assets/7247232/3849832/6e6e8e7c-1e7d-11e4-8293-701e800c9048.gif)
- Fixed disabler sprite, ammo is now split into 4 bright cyan chunks like the egun or taser instead of 3 which didn't work properly
- Added a new item sprite for previously unused large crossbow, tweaked it so it's now the weight of normal guns (eguns for example) and thus fits in backpacks (might be good for admins now)

![biggame](https://cloud.githubusercontent.com/assets/7247232/3849815/5ccf1a1a-1e7d-11e4-9394-f4239cf0d0a6.png)
- New L6 sprites (more tacticool and less shit) with credit to ausops

![9302c8be-e455-11e3-84f7-b5b036bf753f](https://cloud.githubusercontent.com/assets/7247232/3849765/b722a0e6-1e7c-11e4-8c3f-d4d2be7579f5.png)