Edits to temptation and better icons for chaos lores

-Added temptation event for chaos undivided
-Made being a mage a factor for temptation for all events but Khorne,
but still not as much as for Tzeentch
-Other small edits to temptation to better fit lore
-Made new icons for lores of Tzeentch, Nurgle, and Slaanesh using actual
god symbols from those Shade made for religion_icon_strip_small
minor edits/updates to temptation
Chaos temptation fixes, ice lore added.
Few thing on duel engine.
Few thing on duel engine 2.
Merge branch 'master' into pietrko - some illathid changes there