Adding new Wireshark dissector. This is loosely based on the original
dissector, it has been re-worked to bring into line with Wireshark
coding guidelines that aim to ensure portability. It currently only
decodes a handful of messages as test cases, it needs more work to make
it useful. See README.txt for a bit more background.
Merge pull request #396 from hutkev/wip-wireshark-alt

Adding alternative Wireshark dissector. 

Signed-off-by: Kevin Jones <k.j.jonez@gmail.com>