Port to Lomiri on focal

• remove snap packaging data
• port to Lomiri
• update Click packaging
• update Debian packaging for focal
• rename Debian and/or Click package name
• update and move Jenkinsfile to debian/
• rename QML plugin packages
• replace vendored PAM authentication QML plugin with qml-module-pamauthentication (to be split off from terminal-app)
• merge/rename qml-module-archives
• marge/rename qml-module-placesmodel
• merge/rename qml-module-nemo-qml-plugin-folderlistmodel
• update translations

This fixes #98 (closed).

Current review errors:

- desktop:X-Ubuntu-Touch:filemanager
missing key 'X-Ubuntu-Touch'
- desktop:required_keys:filemanager
missing required keys: X-Ubuntu-Touch

See clickable/click-reviewers-tools#4 (closed).