NEXT: update move accuracies

Updated some more moves to multiples of 10 for consistency.
Some tweaks to private rooms

- Allow /warn in hidden rooms, as they can be used in battles which are subject to global rules
- There is no command /secretroom
Update /modjoin to parse /hiddenroom
Merge pull request #1376 from Freigeist/patch8

Some tweaks to private rooms
Merge pull request #1377 from Tempoanon/patch-20

NEXT: Update move accuracies
Merge pull request #40 from Zarel/master

Patch 2.11.1