Test 6.0.38 backports from 6.1 branch (source)

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For all users still using **PHP 7.3 - 7.4**:

I back-ported all features and fixes not breaking the upgrade procedure from the **6.1** branch to **!!(green)6.0.38!!**.
  * ((/Dev/Release/R6.0/ChangeLog/Chronological 6.0.38 change log))

I run a few tests locally with an old ((/Org/Tools/Hosting/TestServer XAMPP supporting PHP 7.3)) running on a virtual machine, but it's almost certain I've missed something.

**Please report back if something breaks.**