Setup a self test

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The self test should be implemented in Python with the Pytest Framework using the remote API.
Each remote API call should be called at least once.
It should be usable for both (GUI and GUI less variant)
This should be also an example how to use the remote API of OpenXilEnv.

The structure of the test:

1. Basic Tests
   Start, connect, disconnect and terminate
   Check the Exit code

2. Blacboard
   Add, Attach and remove variables
   Read and write variables raw values
   Read and write variables physcal values

3. External processes
   Start and stop
   Access to variables
   FMU(s)

4. Internal processes
   Recorder
   Stimulus Player
   Generator
   Equation calculator

5. Virtual bus
   CAN(FD)

6. Internal script
   Each script command should be called at least once