qulogic/talkatu

overhaul convey.yml to have separate plans for everything and add debian-bullseye-amd64, debian-buster-i386, mingw-w64-i686, and mingw-w64-x86_64.
Talkatu is versioned in [mercurial](https://www.mercurial-scm.org/) and is
available on [bitbucket](https://bitbucket.org/pidgin/talkatu).
All contributions are provided via pull requests to the bitbucket repository.