Semi-automated tests

[bjoernQ]

We still have a lot of examples which serve as tests - some still can be turned into hil-tests but some just won't be reasonable to have as hil-tests.

We already introduced the qa-test folder but we can do better

• have a way to run them one by one per target
• before running an example show what setup is expected (e.g. external hardware attached, running something on the host machine etc.)
• have a way to express pass/fail from the test if possible (or let the user decide by eye-balling an attached display or whatever the example/test does)

We can extend the xtask to do what we want probably