Process Listeners V2

[Speiger]

Due to the requests of #413 I am kinda forced to make a new PR.

(Can't switch source branches on an existing PR. At least i don't know of a way)

Now a few changes added.

• 1: Written in an actual IDE instead of Code spaces... (Compiles now at least)
• 2: Tests now included and we find out if they work or not. (Never had maven tests run so Github actions help me) Edit: I tested them they are passing on my machine
• 3: Simple default impl provided with the ProcessListener with the Most likely use case being present.

Hope that this is better :)

[Speiger]

I have to say, some of these rules you included in code formatting are IMO BS.

Since all these are cosmetic, i picked those that are actually useful changes and made them.
If you need to make changes before you merge, then you can do those, but i think the CodeQuality checker is configured way to picky.

[Speiger]

Pr is also complete.
Any changes that need to be done should be done by you at this point.

If that is not possible, please then close the issue.