[prjconf] Add obs project configs.

Signed-off-by: Marko Saukko <marko.saukko@jollamobile.com>
[prjconf] Add prefer mesa-x86-generic-libglapi

Signed-off-by: Marko Saukko <marko.saukko@jollamobile.com>
[configs] added configs for VBoxTouch plugin
[packaging] added -common, -xorg, -wayland subpackages
[packaging] -wayland package now requires qt5 vboxtouch plugin