Added documentation along with minor improvements, handling of both forms of CloudMAC packets and minor changes.

- Added documentation and handling of the two forms CloudMAC packets can assume, the two forms are inbound and outbound. Previously all packets were mistaken as outbound packets.
- Cleaned up the code a bit.
- Fixed VAP identification field tree node, it previously referred to a local tvb rather than the tvb of the packet and displayed six bytes when it only consists of four.