Minor updates to output naming and organization for immuno.wdl

[malachig]

A few small things that would make the final results of immuno a bit tidier:

• At the top level on the results dir we have a file: pvacseq.annotated.tsv. I think it would be more accurate to describe this simply as variants.final.annotated.tsv. The variants aren't really coming from pvacseq. Even though they are coming from the pvacseq sub-workflow, nothing in that TSV is a pvacseq related value.
• At the top level. Rename pvactools -> pvacseq
• At the top level. Rename pvacfuse_predictions -> pvacfuse
• At the top level. Move fusioninspector_evidence to be inside the rnaseq dir
• At the top level. Move fda_metrics to be inside the qc dir

[malachig]

This has now been fixed. Thanks @Layth17 and @tmooney