Excluding keys

[LarsWiegers]

Introduces the possibility to exclude keys via config or parameter to the command.

[jhm-ciberman]

I haven't tested this code in our repository, but I've checked the code changed and it looks fine to me.

Thanks! 😁

[jhm-ciberman]

I know this is the description i used in my PR but currently the package let's you find missing keys but don't have any functionality related to "unused keys/translations". When I opened the PR I just pasted an example description without paying too much attention.
Maybe you can remove that part to better reflect the current functionality of the package.

[jhm-ciberman]

As a side comment about the code, unrelated to this PR:

I saw you use a double for loop to collect the realLines array used to compare.

I'm reading the code from my phone so maybe I'm missing something but that would make the checking to work 2 levels deep, am I right?

Maybe you can use Arr:dot($arr) built in helper (and Arr::undot) to easily collect all the keys.

[LarsWiegers]

Closing as this will be handled in #42