[564658] New Feature : Export Diagram Comparison as images.

A new feature to export a diagram comparison as images. The
image is formed by the two compared diagrams with their phantoms and
markers, the two diagrams are separated by a black separator.

Bug: 564658
Change-Id: I762359439cfeaf25a4f449d852c8e4ec7c1138f2
Signed-off-by: Glenn Plouhinec <glenn.plouhinec@obeo.fr>
17 files changed