publish qxl device id

(cherry picked from commit 2885958174f9a742cc351c124c17610acde7dfd8)
add multi-monitor support in QXL mode

(cherry picked from commit 861b2d2d444f2fc60b58fd2eb1ee8b812a701ce6)
Merge branch 'master' of https://github.com/vrozenfe/qxl-dod

Conflicts:
	qxldod/QxlDod.h