New Worker settings makes it possible to change category according to variables

We needed a way to show the boats with valid dock payments.
And the valid_until was a date-time variable.
So, making a list would be pretty easy.
However, having to open perhaps thousands of objects and then their variables and then calculate if the paid time had expired would be very costly, performance vise.
Using a category instead of a variable would be much faster, like a hundred times faster, since this could be made in the first selection without the need to open the objects.
But how to turn something like a moving target into a static category?
The solution was to add a capability to the Blippa Worker that allows this, based on configurable rules.
Make the setting in Labelsadmin-Settings-Workers: