Move server commands to OperationMessage (#587)

Move server commands to OperationMessage (#587)

* Move server commands to OperationMessage

Implement server & shared commands:
- /open, +open
- /snowopen, +snowopen
- /close, +close
- /captain, +captain
- /down, +down
- /discount, +discount
- /alldiscount, +alldiscount
- /undiscount, +undiscount
- /santa, +santa
- /offsanta, +offsanta
- /kill

Resolves #529, resolves #535, resolves #536, resolves #537, resolves #541, resolves #542, resolves #544, resolves #545, resolves #547, resolves #549

Refs #518

* Allow for new server commands

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