Implement viewports and transforms
This is an implementation of wp_viewporter and transforms
It's based on old patches by Jasper St. Pierre and the weston implementation.
In can be tested with:
weston-simple-damage --transform=[normal|90|180|270|flipped|flipped-90|...] --rotating-transform --use-viewporter [--use-damage-buffer] --scale=[1|2|3|...]
- the gstreamer gtk-wayland demo (https://github.com/swt2c/gst-wayland-gtk-demo)
Implements: #132 (closed)