Guns, medicine and fixes.

**Fixed issues:**
* Fixes  #2385
* Fixes #2384
* Runtime in traitor equip proc.
* Runtime in wound creation proc.

**Gun things**
* Ability to unload gun by clicking it in hand 39554806309283e54ffd6d07dbb9fdd16031b64b
* Distacne calculated properly for miss cahnce now. It used to assume 1 or 0 tiles ALWAYS. 106018ca3be726fea729a7a49e2c26a786d51ed1
* Negative miss chance modificators work properly, making point blank shooting much more effective 9c43050ba7b03801595ddf3c27ab920967c18762
* Projectile that misses target does not disappear, but continues on its way until it hits something. 226a96b38fbd8796174454deafc7c2de4df9ae48
* Can target hands, feet and groin now. Before it defaulted to arms, legs and chest respectively. 9c43050ba7b03801595ddf3c27ab920967c18762

**Medical things**
* Crowbar can be used as retractor in surgery. 
4a6f719f352d84f9e638b386df94558206a38633
* Removed bandages causing itch. main complaint was counterintuitivity. Instead of scratchign the itch or removing bandage, you had ot take medicine. Being most often manifesting side effect did not help. 6015df71784efecb1c1b3fb51463204f359540d5
* Side effects now manifest based on probality. In general, the mroe potent chem, the more probality thtat it will cause side effects. 6015df71784efecb1c1b3fb51463204f359540d5