[Feature request] support for cmd line option --no-* / --skip-*

[drwetter]

Which version are you referring to
3.3dev

Please check this repo whether this is a known feature request
thought it was here but couldn't find it

Describe your feature request (if it's a technical feature)
It would be handy if one can just exclude checks from the default run like --no-robot or --no-client_simulation

There is already an array which was introduced when the rating/grading was implemented: ${SKIP_TESTS[@]}. Here e.g. do variables could be added and later on set those to disabled, like do_robot=false.

Problematic is WHEN those vars are to set. Also the application logic may require some functions to run or at least they should run , so that --no-protocols doesn't make much sense.

See also set_skip_tests(). Careful with eval there.