add support for resfinder v4 output

[fmaguire]

Adjust resfinder parser to support output from resfinder v4
Ideally, this will still be a single parser that auto detects resfinder v3 or resfinder v4 and parses them appropriately a la https://github.com/pha4ge/hAMRonization/blob/master/hAMRonization/RgiIO.py#L23
and https://github.com/pha4ge/hAMRonization/blob/master/hAMRonization/AmrFinderPlusIO.py#L22