v5.1.5: Merge pull request #1519 from avalonmediasystem/staging

New Feature

• Introducing the Track Scrubber: more granular scrubbing when playing a media object or playlist item. Clicking the magnifying glass icon on the Avalon media player will open a second scrubber displaying only the current track (segment of structural metadata) or playlist item

Improvements

• Faster loading times for large playlists
• Faster switching items on playlists
• New environment variable method storage: most configuration options can now be specified via the execution environment instead of configuration files. This makes it easier to deploy Avalon using container or cloud systems (like Docker and Amazon Web Services) that use ephemeral local storage

Bug Fixes

• Masterfile duration reports correctly on android devices
• Fedora Noids properly generate share/PURL links
• Playlist auto-advance no longer skips items