Allow an array or a value in automations regex field

[PabloOQ]

Mentioned in #360 .

In the Automations, the regex field now allows use of both, arrays of Strings or a single String value.
Makes it easier to maintain a big file and more is accessible to add/remove regex to an individual rule.

[github-actions]

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[TrianguloY]

Personally I would have kept the getString method, because that will (according to the documentation) coerce the value (so, even if it's not a string, it will always return a string). This could be done also calling toString anyway.
But I like your generic approach to allow any type, not sure if there will be a need for something similar in the future, but looks good. Let's keep it for now.

I think I would have also created a new JsonUtils class, since these are not technically java utils, but that can be created later if more methods are added, so not a problem.

The only missing thing is to change the auto_editor string to explain this new option, but I just added it myself :)

(also, the code at com/trianguloy/urlchecker/modules/list/PatternModule.java:156 could be extracted to use this new method, although you will need to convert it to an opt...which I may do in the future, so don't worry about that for now)

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_{Edit: Arg, I wanted to do a squash&merge, not a normal merge...anyway. I'm slow today :(}