[NTVDM]

[NTVDM]
The RegisterConsoleVDM API (undocumented) allows NTVDM to get a VGA-like text framebuffer hold by the console server. This text framebuffer is unique, per-console (so that changing the active text screen buffer doesn't change the text framebuffer) and exists even if you use a graphics screen buffer.
NTVDM can write in this framebuffer, and when a call to InvalidateConsoleDIBits is done, it is painted on the screen.

Since RegisterConsoleVDM is unimplemented on ReactOS, I start an implementation of this API *inside* NTVDM (that will then be moved to kernel32/winsrv when it will work correctly).

I adapt the code of the VGA emulation to support RegisterConsoleVDM.

svn path=/branches/ntvdm/; revision=62371