Add LoFreq Subworkflow

[bjohnnyd]

Description of feature

Add LoFreq variant caller subworkflow to viralrecon.

In addition to providing an alternative variant caller, this would make it possible to perform standard analysis for the EasySeq SARS-CoV-2 WGS Kit.

This kit has been used for wastewater sequencing:

Wastewater Sequencing using the EasySeq™ RC-PCR SARS CoV-2