Job JobSchedulerCopyFile: skipFiles Parameter should not depend on other parameters

Current Situation

The parameters skipFirstFiles and skipLastFiles can not be specified at the same time.

The parameters skipFirstFiles and skipLastFiles are depending on the value of minFileAge | maxFileAge and minFileSize | maxFileSize. It is not possible to skip Files without specifying one of the depending parameters.

Desired Behaviour

It should be possible to specify the parameters skipFirstFiles and skipLastFiles at the same time.

The parameters skipFirstFiles and skipLastFiles should not depend on the value of minFileAge | maxFileAge or minFileSize | maxFileSize. It should be possible to skip Files without specify one of the depending parameters. The skip should work on the given ordering that is specified with sortOrder and sortCriteria.