Cleanup of unused or outdated files

[HomesGH]

Description

There are a lot of outdated or unused files which haven't been touched in ages. Those are probably not in use anymore or not even compilable. Therefore, we should delete them.

The following is deleted:

• Empty files
• validation folder (which was used by Jenkins in the past) since it is not used anymore. The input for the CI is now based on the examples.
• Unused files in the examples folder: argon.sh (just runs the argon example) and comparison.xml (which is a random config xml)
• Tools to convert VERY old mader files to ls1
• Tool to accumulate values of the ResultWriter since this is probably not used anymore (use Python instead)
• standalone generators since this functionality is now implemented in ls1 using the ObjectGenerator in the xml config directly --> Remove standalone-generators #364
• GUI-Tool for generators since (I think) nobody uses them and they are probably outdated
• grideval since it is not documented and, therefore, probably not used anymore

Moved files:

• Script to check several build options moved to checks folder

Resolved Issues

• Unused code cleanup #282

How Has This Been Tested?

I had a look at the git history and tried to decide if the file/folder is still in use or will never be in the future.
Maybe I have deleted too much, so feel free to give some feedback or suggest further files.

[cniethammer]

Thanks for taking the time to go over this - that's a really good bunch of cleanup!