Added a number of feature flag checks to config updates
Added legacy group disappearing message timer handling
Updated the string linter to clean up the build logs a little
Split the initial config dump generation into it's own migration so it can run the launch after the feature flag is toggled
Fixed a few issues with the initial config dump creation
Fixed an issue where "shadow" conversations would be left in the database by opening a thread and never sending a message
Fixed a bug where duplicate members could be added to legacy groups
Fixed a bug with using animated images for the avatar
Fixed a bug where avatar images which were already on disk could be re-downloaded
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