1.16 Rewrite: Functionality

[Keridos]

Some of the old code can be reused (only those that Keridos wrote, due to licensing issues). The full trust system is in OMLib which does not to be rewritten, due to me being the sole author of it.

• [ ] Targeting Stuff: range checking, target validity checking
• [x] Inventory Access
• [x] priority sorting targeting
• [ ] Caching system for upgrades, addons etc.
• [ ] Network Sync stuff
• [ ] Sounds