ORAS updates

- Released Cosplay Pikachu
- Updated learnsets
- Updated NEXT
- Removed ORAS mod
- Removed hardcoded set bans that are now legal
Sylveon set is also legal
Add Beldum event
Skrelp and Dragalge's HA is released.
Primal Reversion occurs before ability messages activate

Moved primal reversion checks to the SwitchIn event.

Moved the SwitchIn event to properly account for turn order.
Merge pull request #1319 from ascriptmaster/primal

Primal Reversion occurs before ability messages activate
CAP Playtest has ended
Merge branch 'master' of github.com:Zarel/Pokemon-Showdown