Test install, run, uninstall

[cclauss]

This is finally ready for review...

    strategy:
      fail-fast: false
      matrix:
        commands:
          # Enter hackingtool starting from the main menu with \n as the delimiter. 
          - '17\n0\n1\n\n99\n99\n99'  # Install, run, update, update system,      press ENTER to continue, back to main menu, quit
          - '17\n0\n2\n\n99\n99\n99'  # Install, run, update, update hackingtool, press ENTER to continue, back to main menu, quit
          # - '17\n1\n1\n'  # Install, run, uninstall, press ENTER to continue
          - "99"  # Install, run, quit

allows us to walk up and down hackingtool's menu hierarchy to try out different commands.

I will enable the commented-out uninstall test in a follow-up pull request after this one lands.

That test needs the change made to tools/tool_manager.py where after hackingtool has been successfully uninstalled, we do not try to go back to the main menu because it no longer exists!

When merging this, please do Squash & Merge...

...to keep all these little commits out of your repo.