[441483] Update name of Sirius tests plugin

where it is hard coded in test data or test code

Bug: 441483
Change-Id: I192655254c7f8b65c1f811276ea469f7ad87a54c
Signed-off-by: Laurent Redor <laurent.redor@obeo.fr>
[445195] Reconnection move only last(s) bendpoint(s)

Following the evolution
https://bugs.eclipse.org/bugs/show_bug.cgi?id=444057 on reconnection
only the last bendpoint, or two last bendpoints depending  on the
routing style, should move. This way the previous edge layout will be
kept once reconnected.

Bug: 445195
Change-Id: Ie8f39d5b1d689130a565abcdb4c6381aab7f2377
Signed-off-by: Steve Monnier <steve.monnier@obeo.fr>
[441483] Fix more references to the tests plug-in ID

Bug: 441483
Change-Id: I88afa20cb41a0fbcad0959f65d976e45eeab206a
Signed-off-by: Pierre-Charles David <pierre-charles.david@obeo.fr>
[444569] Add the action to reset diagram origin

* Add the action within the diagram context menu
* Bind it with "M1" + "&" shortcut
* Add a new ResetOriginEditPolicy on DDiagramEditPart that will return
the resetOrigin command.
* Update the user documentation and the release-note.

Bug: 444569
Change-Id: I8190e8e2f25e4ca1d0c9f5e733e0aa83d5425016
Signed-off-by: Florian Barbin <florian.barbin@obeo.fr>
[444759] Fix NPE for Oblique routing style

Fix problem detected in
https://bugs.eclipse.org/bugs/show_bug.cgi?id=444759#c3

Bug:444759
Change-Id: I8afc0fad596b52c8e304deb12a9ba09f587475eb
Signed-off-by: Laurent Redor <laurent.redor@obeo.fr>