Suricata

Refactor and cleanup
- Offset
- Depth
- Distance
and similar values throughout the keywords/transforms that support them.

65535 is a bounding value for many offset/depth usages but in other places, a signed 32 bit value is used.

The values supported should be examined for
- Consistency throughout the Suricata keyword set
- Relevance to the data blocks that they are applied to

We should be careful to document all changes
- Changes that result in more restrictive value ranges should be carefully considered and ample warning provided if existing usages won't be accepted
- Changes that relax value ranges should be called out in upgrade and documention.