Tick accessibility boxes

[OctarineSourcerer]

This is likely to make some development a bit knotty and kill a couple styles, so I'll likely save it for after the sheet works, but:

• [ ] Labels for each editable thing on the sheet. For groups, use fieldset and legend. May be a bit tricky with stats, if you want clicking the stat name to roll it instead of providing more hit area for the stat base value.
• [ ] Figure out testing colourblindness. The sheet should hopefully do pretty well there, it being grayscale.
• [ ] Add tooltips for a Whole Lot of Things. I intend to do this anyways.
• [ ] Check font is pretty readable for those with dyslexia. Provide an alternative one for those with?
• [x] Make wound track boxes bigger, or their targets at least. They look damn cool, but are a bit hard to click atm.

If I think of anything more, I'll add it to the list. If anyone wants to add suggestions, please comment :)