v0.14.20

This is a regularly scheduled bugfix and improvement release recommended for all users.

Resolved issues:

* #3197: There is now a warning when adding a folder that is a parent of an existing folder.
* #3912: Using -logfile flag together with -no-restart now causes an error instead of silently failing.
* #3891: Weak hashing is now disabled completely when the threshold percentage is > 100.
* #3921: Rate limiting now actually works on ARM64 builds again.
* #3924: An issue where UPnP port allocations would be incorrect under some circumstances has been fixed.

Also:

* Weak hashing is a bit faster and allocates less memory.
* The hashing performance reported at startup now includes weak hashing.
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