* minor rework
* fixed columns of tab item loot
* fixed lookup of classes/races (as they are the only type used as bitmask)
* implemented reverse lookups everywhere (arguably class, race and skill are too spammy)
* reverse lookups no longer contain redundant data
* changed how the groupKey is set, so there are no more cases that can't be looked up
* fixes#273
* title: added tab 'criteria-of'
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