Add max read depth filter and remove others

- Add max read depth filter (Closes #126)
- Remove strand bias filter (for now) as the current one was ineffective (see #123)
- Remove other unused or unhelpful filters (unambiguous mapped, overlaps deletion)
- Improve complex region filter to look at unmapped or poorly mapped mates as well
maybe rename this method since it's now min/max instead of just min?