All in-use contents of org.simantics.g2d.event package were moved into org.simantics...

All in-use contents of org.simantics.g2d.event package were moved into org.simantics.scenegraph.g2d.events.
This was necessary in order to unify the event handling between G2D and scene graph and to make it possible
to propagate higher level events originating from the Eclipse Workbench, such as CommandEvent to scene graph
nodes which are currently only able to process AWT events and nothing else.

This is only the groundwork for taking the G2D events into use in the scenegraph,
i.e. moving all the necessary code into scene graph plug-ins.

If your code breaks as a result, organizing your imports should fix the problems in most cases.

git-svn-id: https://www.simantics.org/svn/simantics/sysdyn/trunk@22336 ac1ea38d-2e2b-0410-8846-a27921b304fc