v0.5.3

• workaround for buffer progress bug on Firefox (#587 by @Yurifag)
• downscale cover images on the server to save bandwidth (#589 by @Faldon)
• fix track being removed from all users when unshared from a group (#581)
• fix broken navigation bar layout on recent development versions of Nextcloud 13
• slightly improve the performance of the /collection and /scanstate endpoints with large music libraries (related to #588)
• fix /collection endpoint occasionally failing with code 500 when called during scanning
• do not show the loading indicator indefinitely if getting the /collection endpoint fails for any reason