Snap compatibility

[stoically]

Snap related issues when trying to use native messaging:

• error while loading shared libraries: libsqlcipher.so.0: cannot open shared object file: No such file or directory or "no such native host" when installing the native manifest on user level, because snap runs in its own sandbox
  • Related Firefox issue: https://bugzilla.mozilla.org/show_bug.cgi?id=1462888
  • Related Chromium issue: https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bug/1741074

Might need an interface: https://snapcraft.io/docs/interface-management