v1.2.1-rc.1

This is a release candidate for the v1.2.1 patch release.

Bugfixes:

 - #5801: panic: close of nil channel in relay client stop
 - #5803: Web UI shows confusing description on RC builds when upgrades are disabled
 - #5828: panic: Index update for not running folder
 - #5833: Paused folder shows filesystem watcher error
 - #5837: panic: runtime error: index out of range in recheckFile
 - #5849: Cannot concatenate external versioner template variables ("%FOLDER_PATH%/%FILE_PATH%")

Enhancements:

 - #5811: Download progress of folders in the UI should update more frequently

Other issues:

 - #5754: Support paging on jobQueue.Jobs
 - #5813: Potential bugs on old cores: using 64-bit functions sync/atomic
 - #5853: Inconsistent handling of empty folder path
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