v0.14.51-rc.1

This is a release candidate for v0.14.51.

Bugfixes:

 - #2370: Scanning and deletes should be processed even when above the free space limit
 - #5078: panic: nil pointer dereference when unpausing folders
 - #5117: cmd/stdiscosrv: Not enough traffic breaks replication between discovery servers
 - #5125: Symlinks marked as removed on windows
 - #5127: Parent directories of unignored files keep being included and immediately ignored again
 - #5131: Progress updates are ignored for send only folders
 - #5151: cmd/stdiscosrv: Should not allow localhost addresses
 - #5180: Docker image fails when PGID set to existing group
 - #5183: panic: bug: Notify backend is processing a change outside of the filesystem root

Enhancements:

 - #2291: Permanently notify about initial connection requests
 - #4782: Reduce unnecessary syncing / database traversal
 - #5163: GUI authentication using LDAP

Other issues:

 - #4758: Suture services should not survive panics
 - #5110: Run folder tests in temporary directories
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