net/rdp2tcp: New port: Tunneling tool on top of RDP

It uses RDP virtual channel capabilities to multiplex several ports
forwarding over an already established rdesktop or FreeRDP session.

Available features:

• tcp port forwarding
• reverse tcp port forwarding
• process stdin/out forwarding
• SOCKS5 minimal support

The code is splitted into 2 parts:

• the client running on the rdesktop or FreeRDP client side
• the server running on the Terminal Server side

This port only contains client and tools.

https://github.com/V-E-O/rdp2tcp

PR: 289964