Ability list breakdown by category

[eevee]

Lots of abilities are clearly related, but given one it's difficult to find the others, because the game order is arbitrary and name order has no semantics either.

Would be sweet to break abilities into categories the same way items are.

e.g.:

• Insomnia, Immunity, Own Tempo, Inner Focus...
• Storm Drain, Lightningrod
• Guts, Marvel Scale, Quick Feet...

Also it would be great if ability pages listed other abilities in the same category, for ease of finding similar abilities (and abilities with exactly the same effect but different flavor).

So:

[ ] add categories to pokedex
[ ] allow sorting ability list by category (optional, or always? is purely by name all that useful?)
[ ] show categories on ability pages