RDP support

[Antoine Martin]

Following popular demand... Let's implement RDP client/server support.

• an rdesktop client wrapper
• an xrdp based server plugin (which will need to override the authentication phase with one of our tokens - replace sesman?)
• the full server build for Windows

The Windows server is going to need:

• way to control the RDP server if possible (unlikely)

Depends on #104

[Antoine Martin]

initial RDP support: r2588

Limitations (mostly of RDP itself):

• current user is logged out if we take over the session!
• seamless is very unreliable and requires the changes to the registry to prevent Windows from displaying the whole desktop... sigh (set NoDesktop==0)
• VNC seems to crash if launched from an RDP session!

Still a fair amount of work to do on this...

[Antoine Martin]

Not doing seamless mode as it is just completely unusable for our purpose.

RDP support is now pretty good: the active windows display session is detected and can be sent around, we detect session events so we know when it is re-connected to the main display (when the user logs in again).

VNC sessions will drop when RDP is started (not a bug - a feature: VNC can't run when RDP is active), and the UI should prevent users from trying to start a VNC copy when RDP is active.