Basic RDP dissection, which can dissect the connection sequence.

Basic RDP dissection, which can dissect the connection sequence.
A work in progress.
Can be used with the SSL dissector to decrypt Enhanced RDP Security SSL.
With Standard RDP Security (e.g those on Wiki), the PDUs are all encrypted
after the SecurityExchange PDU.
Wiki to be updated with an example SSL protected capture and associated
key material.

git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@39066 f5534014-38df-0310-8fa8-9805f1628bb7