Based on code from GuoJunBo <guojunbo@ict.ac.cn>
git-svn-id: svn://svn.code.sf.net/p/rdesktop/code/trunk/rdesktop@473 423420c4-83ab-492f-b58f-81f9feb106b5
RDPSND), in particular:
* channel layer takes care of virtual channel header
* split X dependent parts out of CLIPRDR, simplified IPC implementation
* initial RDPDR implementation
git-svn-id: svn://svn.code.sf.net/p/rdesktop/code/trunk/rdesktop@431 423420c4-83ab-492f-b58f-81f9feb106b5