Added drawing buttons to Pick tab. Rubber band shape selection.

Re #7222.
Adding missing image file. Re #7222.
Miniplot shows sum of counts in detectors covered by shapes.

Refactored 2d shape classes to work with multiple selections. Re #7222
Adding shapes to selection by ctrl+click. Re #7222
Added the ring shapes. Fixed ellipse's contains method. Re #7222
Update miniplot when instrument moves in 3D view. Re #7222.
Refresh the miniplot after change of x-range. Re #7222
Merge remote-tracking branch 'origin/feature/7222_share_drawing_tools'