Initial commit for SKI_FavoritesManager.psc

Basic, not-completely-stupid functionality in OnGroupUse for weapons,
armor, ammo, spells, power, and shouts.
* Added support for group-specific flags

Flags use bitwise operations. Also fixed a couple of global variable
names for uniformity.
* Added SKI_FavoritesManagerInstance Quest

Two autofilled properties in quest script:
Actor PlayerREF
SoundCategory AudioCategoryUI

Script will fail if these are not populated!
* Added sanity check to the script properties

Makes sure PlayerREF gets set even if someone forgets to assign the
properties correctly.
Throws a warning if AudioCategoryUI isn't set.
* Added support for torches, potions, ingredients

and possibly scrolls
Merge branch 'master' of https://github.com/Verteiron/skyui
* Reverted SkyUI.esp to previous revision.
* ConfigBase.psc cleanup
* Filegroup stuff for fav menu
* Added FavoritesManager to esp
* Some additions and refactoring of SKI_FavoritesManager.psc. Basic sending&receiving of fav data is working.