Added a script and Makefile target to generate the
state machine diagrams.  New diagrams included.

New docker base images include new cppTango and more
of the Python dependencies.  Including pytest-forked.

The docker-executor runner is deprecated, replacement
is k8srunner.

SAR-167 (SAR-168) Remove docker compose from the CI pipeline

See merge request ska-telescope/lmc-base-classes!29

[MCCS-195] Mock out pytransitions in sphinx docs build

See merge request ska-telescope/lmc-base-classes!30

0.6.5 observation state machine fix

See merge request ska-telescope/lmc-base-classes!27

- Observation State Machine:  add transition from RESETTING to ABORTING.
- Base Device State Machine:  update title, remove on_enter labels.

Pytransitions refactor

Closes MCCS-59

See merge request ska-telescope/lmc-base-classes!26

Add base device state model tests, and fix fatal error bug

See merge request ska-telescope/lmc-base-classes!25

Fix AttributeError on _set_obs_state (transitions dict update)

See merge request ska-telescope/lmc-base-classes!24

When running multiple devices via MultiDeviceTestContext, it
could result in failures during initialisation like
```
AttributeError: 'SKABaseDeviceStateModel' object has no attribute '_set_obs_state'
```

Issue was caused by updates to the transitions dict class variable
instead of maintaining a unique instance per object.

And include CSIRO as author (@drewdevereux).

On() and Off() to base device, plus event pushing

This merge request does the following:
* Adds support for the ON state in the SKABaseDevice. This seems to be a minimum requirement for devices that subclass SKABaseDevice to be functional/extensible.
* Moves the commands On() and Off() from the SKASubarray to the SKABaseDevice.
* Adds pushing of change and archive events for changes to device State, adminMode and obsState
* Adds some test infrastructure for testing events
* Remove all mention of polling in XMI files, and disable all attribute polling in code (only obsState and obsMode affected).

These changes are non-breaking, so the version is bumped to 0.6.1.

See merge request ska-telescope/lmc-base-classes!23