Modified MAX_MISSIONAREA and questmission packet to make add-on missions display.
It has a flaw: what your menu displays doesn't update right away. This is purely cosmetic, zoning will force it and can be fixed later.

New GM command:
@checkmission Prints target player or GMs mission status to in game chat log.

First 3 of 12 ACP missions. More ACP missions incoming. A settings.lua option to enable/disable the entire add-on is included. Confrontation battle with Seed Mangragora isn't working, and repeats for Amber Key have been commented out till that is ready.

Missions lists and Key Item lists updated.
Keyitems are now listed in order of ID. That specific work is Compmike19's and I wasn't going to un-reorder it just to add missing KIs.
Merge pull request #63 from TeoTwawki/ACP-only

ACP related stuff