TODO

Fix: Initial load pointString validation (make sure all talents are valid and their deps are met)
Fix: Tooltips cause horizontal scroll on less-wide screens. Investigate.
Responsiveness:
- Tooltips on mobile need different UX
Talent tree:
- Reset button per tree (?)
Tooltips:
- Support multiple positions for tooltip (currently only top-right with fallbacks based on viewport)
Move icons back under /src when https://github.com/facebook/create-react-app/pull/6060 is released as part of 3.0.2