Allow 'or' and 'and' in queries

[Chgrau]

Hello

I would be very nice to allow more expressive queries, in particular, I would like to be able to use 'or' and 'and' for description queries. Going further, allowing full regular expression would be nice, but perhaps overkill.

Example for new syntax:
description (includes|does not include) (<string>||<string>||....||<string>)
description (includes|does not include) (<string>&&<string>&&....&&<string>

Example of use:
description includes thisword && thatword
Should match
- [ ] Tasks using thisword and thatworld
Should not match
- [ ] Task using only thisword

[schemar]

Please see #121. You can vote and comment there. Thanks!

[claremacrae]

Both full regular expression support and boolean query combination have been released for some time.