Fixed the cropping preview and it's working brilliantly.
Fixed false initialization state of crop vector.
Cropping now implemented in the frameserver. There is still a bug with
cropping multiple times but otherwise it works well. All that's missing
now is resizing the quad in the renderer to reflect the new resolution
of the cropped stream.
Fixed the bug causing wrong display of the stream when cropping multiple times.
Fully implemented cropping!