TRON-Bioinformatics/tronflow-mutect2: Release v1.7.0

Changes The GnomAD resource is now optional, in case it is not available or you don't trust how it is used. When --gnomad is not provided then the contamination estimation steps are skipped. Also the filtering of common germline mutations is disabled. As an alternative a contamination estimate can be provided through --args_filter "--contamination-estimate 0.2