release-0.5-6

This is a test build, you may only try this if you know what you're doing.

• bugfix: fix directory progress cache/state handling
• bugfix: display correct progress in more places while seeking (and the file is not seekable)
• enhancement: optimize cassette animation bindings
• enhancement: various small performance optimisations
• enhancement: reduce player page layout complexity/bindings
• maintenance: docker sdk compatibility
• maintenance: sync transifex translations
• maintenance: (test) add github build action