Create set of messages for global coordinated status

[diverjoe]

Horrible title - need to be able to have things like a "feeding" topic (MQTT) that the user can subscribe widgets/actions to in order that they may be stop/started/suspended an example would be the filter relay would subscribe and be set to turn off during "feeding/start" and back on with a "feeding/stop" Others could be leaks, overflow, high temp (fans, lights, heater), dosing and AWC (Automatic Water Change)