improve user feedback when interacting with moderation

[cblgh]

this pr adds

• /actions - list historic actions by you or your currently applied moderators
• /roles - shows the admins/mods you have applied atm
• new virtual message type: chat/moderation see https://github.com/cabal-club/cabal-cli/pull/192 for how it is used cc @nikolaiwarner
• adds support for displaying realtime moderation actions by other moderators/admins, see cabal-cli pr above for what that looks like
• fixes a bug with setFlag, also reverts _setFlag to return a stream instead of promise
• fixes ordering of virtual messages (they weren't being sorted properly before)
• adds better user feedback for various moderation actions

[cblgh]

sorry about the wacky indentation, was trying a new thing in vim. looks like all that was being changed in my editor was purely visual; i'll run standard before releasing