Filtering in Compendium

[fmasa]

Currently, there is only a search available.

Be able to sort basic and advanced skills in the compendium or make two tabs inside it

from #189 (comment)

Other use cases I encountered:

• When adding spells to NPCs, I want to see only e.g. Tzeentch and petty spells
• I want to see only weapons when choosing trappings for enemy NPCs.

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Solution: There should be a way to filter items (both in Compendium screen and in Compendium item chooser) by various fields.
This should be further specified.