This patch finishes the set of patches which fixed bugs in zoom/pan and
added tests for it. This patch introduces the following:

1) We don't use documentOrigin() anymore. At all. The centering is done
directly inside the transformation inside the KisCoordinatesConverter.
2) Fixed bug when KisCanvasController used setScrollBarValue() for
correcting the offset, which caused poisoning of
preferredCenterFractionX/Y. This was quite subtle bug.
3) Added tests for rotation of the canvas with and without vast scrolling

BUG:296203