v0.14.49-rc.3

This is a release candidate for v0.14.49.

Bugfixes:

 - #4925: Deleted files within deleted directories aren't detected with FS watcher
 - #4944: Edit Folder UI displays default "Full Rescan Interval (s)" value instead of the actual one
 - #4981: Race on folder restart
 - #4983: Impossible to edit folder with path "/"
 - #4990: Incorrect large block size chosen for large files on 32 bit archs
 - #5002: v0.14.48 panic: runtime error: index out of range

Enhancements:

 - #4953: Speed up delete propagation when it's not a rename
 - #4969: Executable files edited on Windows should retain execute bit on Unixes
 - #4977: Disable rescan button while scanning instead of hiding it

Other issues:

 - #4900: Replace deprecated `github.com/kardianos/osext` with standard library's `os`
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