Added manual rotation to the GroundOverlayFrame in edit mode.

Review Request #123259 - Created April 5, 2015 and submitted - Latest diff uploaded

Information
Dávid Kolozsvári
marble
master
Reviewers
marble

Until now it wasn't possible to rotate the GroundOverlayFrame manually, only from it's properties menu, setting the angle in a spinbox.
This patch introduces a user-friendly manual rotation in edit mode, as well as new icons(thanks to Torsten Rahn) which are shown as handles around it's edges and corners.
Also, a bug was fixed in this patch: the GroundOverlayFrame wasn't able to capture the mouse events that occured outside of it's regions while a controlpoint(handle) was grabbed.

Testing was done by me and it works fine.

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