Python API: management of properties

[yoogx]

This ticket is to discuss the management of properties in the Python API. For now, a first design has been implemented. The getPropertyValue returns a list of strings with the value of the property.

Like this:

    -> properties:
      ['source_stack_size', '13952 Bytes']
      ['deadline', '500 ms']
      ['compute_execution_time', '0 ms .. 3 ms']
      ['dispatch_offset', '100 ms']
      ['period', '500 ms']
      ['dispatch_protocol', 'periodic']

This basic design imposes another step of parsing on the user side to retrieve units, process ranges, etc.

A working example is in tests/visitor.py

This ticket is to discuss further enhancement to this initial design.

[yoogx]

The design is mostly satisfactory for now, closing