Fetch objects from /add objects to a given PDFGroup

[appfrosch]

In an app where I was using the package, I was confronted with the problem that I had already rendered content in a PDFGroup that I wanted to add to another PDFGroup.

I am very sure that I am holding it extremely wrong and that there must be another solution to this problem already that I am not seeing–but at the same time, I came up with a solution that works for me:

• creating a getter to fetch the internal PDFGroup.objects array
• creating the func PDFGroup.add(_:_:) to to add an object (which is a tuple of PDFGroupContainer and PDFRenderObject to a PDFGroup

Since PDFGroup.objects is internal, an extension from my own app didn't work–so I added the code to the package itself.

I had this solution of mine in place now for a few months, but due to some git actions it seemed that my change had dissappeared from my local copy of the package–which meant I had to understand the problem (again) and reimplement my solution.

This time around I decided to fork the project though to not end up in a place where I have to reconstruct everything again–and also I thought, perhaps it might be of use to others as well, so why not create a pull request for it.

I am not that experienced when it comes to participating in open source, so let me know what I can improve on, if something comes to mind.

Also, and I'm repeating myself here, I am quite sure there must be a better solution to my problem–so if you can hint to that so that I can get rid of this hack again, please let me know