Documentation Updates

• Mostly documentation updates.
• Attempt to move documentation from README.MD files into doc.go files where possible
  so that plain old godoc won't miss too much.
• Replace scripts/flash-bench with scripts/comp.
• Change guts of infra.EmptyAttr for speed.
• Remove deprecated functions.
• Change json.Parse to take byte arrays and return errors.
• Add json.Expect which takes strings and returns errors within the resulting map[string]any.