The new order has the following advantages:
- values 0=OK and 1=Fault are compatible with frequent use of booleans like "is_error"
- values are matching ("accidentally") the DOOCS convention

modernise StatusMonitor interface

add convenient way to create constant PVs for use in generic modules

Killenb/7834 circular dependency faulty flags

Circular dependency detection: Outputs which are pogrammatically set to faulty are treated like external inputs.

Wip mhier 7982 status aggregator

After discussion with Martin K. we concluded that this monitor makes no sense. Legit cases should use the ExactMonitor
instead (if e.g. a boolean on/off configuration switch is to be observed). The monitoring of a Status value makes
no sense, since we would then have a monitor monitoring another monitor. In that case, the behaviour of the other
monitor should either be corrected, or the monitors should be aggregated with the right aggregator mode.

- introduce StatusOutput class
- rename ChimeraTK::States enum to ChimeraTK::StatusOutput::Status and make strongly-typed
- introduce reserved tags to detect StatusOutputs to be aggregated

- Implemented but not tested yet
- All existing tests passing

* Not implemented yet. Currently always return false.
* Test exists and compiles, but is failing due to the missing implementation.