Redo the RandR code in Xvnc/libvnc to use the modern 1.2 API. The old

Redo the RandR code in Xvnc/libvnc to use the modern 1.2 API. The old
stuff was a bit buggy, and it didn't really allow us to move forward.
This commit temporarily removes the ability for the client to resize the
session. It will be readded for Xvnc in a later commit. libvnc will be
without that functionality for now, as it is very difficult to get right
there.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4931 3789f03b-4d11-0410-bbf8-ca57d06f2519