4.2: Improved simulation workflow

Improved workflow to replicate systems in few minutes.

See the docs:

https://github.com/tango-controls/SimulatorDS/blob/master/doc/gen_simulation.rst

SimulatorDS 1.1

Adapted to run the Elinac demo

SimulatorDS 1.0

First release since migration from PySignalSimulator.

Adapted to run the Elinac demo: https://github.com/sergirubio/VACCA/tree/master/examples/elinac