Rewrite to EGPLib objectcontrol.lua (#3038)

* Refactor objectcontrol.lua
Rewrote EGPLib init
Moved EGP to a subtable of E2Lib(?)
Modified E2Lib init to merge any preexisting value

* Rename objectcontrol.lua to objects.lua

* Update API usage

* Somehow removed this by accident

* Fix improper function call

* Add missing `isAllowed` local

* Possibly insufficient check if error is legitimate

* Add nil checks

* Change EGP postinit handling

Author: Denneisk