v0.14.40-rc.4

This is a release candidate for v0.14.40.

Resolved issues since v0.14.40-rc.3:

* #4471: Panic on initial startup

Resolved issues since v0.14.40-rc.2:

* #4464: Stopped send only folders work

Resolved issues:

* #3628: More data is reported as part of the anonymous usage report.
* #4392: Sync errors are better reported.
* #4405: Removing paused folders does not cause a panic.
* #4414: Local IPv4 discovery is more resilient against write failures.
* #4431: Clearer logging around config failures at startup.
* #4432: Do not complain about inability to fsync files.
* #4446: KCP connections are improved.
* #4451: Folder health checking is improved.
* #4453: STUN mappings are more stable.

This release also includes built in support for file system notifications,
although it is disabled by default. To test this functionality, enable the
advanced folder config `fsWatcherEnabled`.

Additionally, the UDP based "KCP" protocol is now enabled by default. This
provides better connectivity through NAT devices. TCP is the preferred
connection protocol when available.
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