Rework of pickup, drop, and give items feature to fix money duping, and other fixes

- Refactored the system for dropping, picking, and giving items (hopefully blocking exploits)
- Modified logic so that you are able to sell/drop your mobile phone (you still get a free one after dying)
- Changed IDs of gang members to be same as player UID (should be somewhat faster then previous method)
- Removed the "use" action for key chain
- Removed the KeyChain dialog
- Changed the way that keys are given to other players, now you just click on the Give button, from inventory
- Changed the way that keys are dropped, now you just click on the Drop button, from inventory
- Disabled the ring factory, as it was not serving any purpose other than glitching free diamond rings
- Added open tractor to truck shop, and vehicle factory