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/
• update translations
• change camera-app name

This fixes #112 (closed).

Current review errors:

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

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

- security:policy_groups_safe:gallery:picture_files
(NEEDS REVIEW) reserved policy group 'picture_files': vetted applications only
- security:policy_groups_safe:gallery:video_files
(NEEDS REVIEW) reserved policy group 'video_files': vetted applications only
- security:redflag_fields:gallery.apparmor
found redflagged fields (needs human review): read_path

These have not changed.