2.1.0

There are no changes in functionality in this release, i.e., existing patches should continue to work as before.

Notable changes:

• Faust updated to 2.54.9
• sign-on message is now shown at normal log level (additional console output from Faust programs still needs log level 3 or more in vanilla Pd)
• various other smaller bugfixes and documentation updates, please check the commit history for details

Build system:

• added Debian/Ubuntu builds (these are on the OBS, where we also provide Fedora packages)
• added GitHub CI (replacing appveyor+travis, CI builds can now be found on the Actions tab)

Please note that the OBS builds are still a bit experimental at this time, please report back if you find any issues with these. If the OBS packages don't work for you, try the ubuntu package we provide below; this has LLVM statically linked and should hopefully work on any x86_64 Linux system with recent base libraries.