wavbreaker 0.14

Added

• contrib/track-break-to-ffmpeg.py: Script to convert an exported track break
  file to a shell script using ffmpeg
• CHANGELOG.md: Added

Changed

• Migrated CI from Travis to Github Actions
• Improved .desktop file for Linux
• Add %F to Exec= line (patch by Sebastian Ramacher, from Debian)
• Add French translation (PR #11, by Olivier Humbert)
• Add MP3 mime type, fix categories
• Snapcraft: Reduce snap size by not shipping system libraries
• Flatpak: Upgrade to Freedesktop SDK 20.08