ReadGroupArgumentCollection should not use GATK AddOrReplaceReadGroups args

[magicDGS]

The ReadGroupArgumentCollection class uses GATK's AddOrReplaceReadGroups arguments, but this was a port of a picard tool which was removed when GATK changed to import the picard project instead. To update GATK to the 4.0.0.0 release, we should:

• [x] Remove usages from missing class in GATK 4.0.0.0 - until it is updated and picard changed, we should use placeholders in our argument definitions.
• [ ] Port the changes of AddOrReplaceReadGroups for the argument names to picard
• [ ] Use the AddOrReplaceReadGroups arguments from picard in our code.

[magicDGS]

Move to pending: I should decide if a port to Picard is worth!

[magicDGS]

After all the problems that using arguments from Picard/GATK in our toolkit, I decided to do not go in this direction anymore. It is true that GATK was a pre-release when I was using it for ReadTools, but still it might be problematic at some point. Maybe I will come back to the idea later.