A more general newbot flag/parameter (eg. --flag foo=bar)

[4maxam4]

For some use cases it would be helpful when the flags can have some values attached.
newbot -c config.config1 --flag foo=bar tc.testcase
0001-newbot-Add-more-general-flag-handling.patch.txt

[Rahix]

Hi, thanks a lot for the contribution! Please send the patch as a GitHub pull-request for me to include it :)

[straxy-aira]

This sounds like an interesting contribution, I would like to see this option in tbot!