feat(event): Implement Seasonal Shop
fix(event): Better shop flow
feat(event): Mystery migration
feat(event): Quests and Bailey
fix(event): quest syntax
fix(event): Better quest text placement
Merge pull request #4408 from SabreCat/seasonal

Winter Wonderland 2015 Cont'd
Define the variable to control display of the + icon and the onClick functionality
Remove the + icon if this file is included in the Buy Gems popup