* Try to allow chained promotion picking
* Reorg PromotionPickerScreen into own package
* Draft for new PromotionTree
* Change PromotionPickerScreen to use new tree (picking still not done)
* Finish new PromotionPickerScreen - code
* Finish new PromotionPickerScreen - assets and linting
* Finish new PromotionPickerScreen - polish positioning and lines
* Finish new PromotionPickerScreen - fix sound
* Finish new PromotionPickerScreen - little optimization
* Finish new PromotionPickerScreen - emphasize line along path
* Finish new PromotionPickerScreen - merge fix
* Finish new PromotionPickerScreen - address comments
* Finish new PromotionPickerScreen - fix sort and update wiki