Usability without ROS

[ct2034]

Currently, the python package can only be used with ROS.
As fas as I can tell this is mostly because of the imports:

• AS2FM/src/as2fm/scxml_converter/scxml_entries/scxml_ros_action_server.py

  Line 24 in 75fe45d

  from action_msgs.msg import GoalStatus

  and

• AS2FM/src/as2fm/scxml_converter/scxml_entries/scxml_ros_action_client.py

  Line 24 in 75fe45d

  from action_msgs.msg import GoalStatus

[ct2034]

This may also involve a reorganization between jani_generator and scxml_converter.

[ct2034]

Generally, things like additional tags (for example the ones related to topics) should be and optional add-on.
Optional in the sense, that

• removing them does not break anything else
• it would be easy and well documented for a contributor to add their own "additions'
• functially, they translate something that is considered high-level (HL-) SCXML into low-level SCXML