Feature/combine gatk picard

The merging of the backends are complete.

The only thing missing from GATKBackendsTest half of the merge is the HTML output functionality. This will be added soon later.

I have also moved the testing resources to one folder (example vcf's, bams, json input) for use. I have also combined the JSON query to be used.

Am I correct in assuming that we can completely remove the seperate backbendtest classes after we merge this?

Also, i'm wondering if it is possible (after this  gets merged to develop) to merge develop into a current feature branch, say pluginsim (pluginsim is really outdated right now).