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ROIs on image widget

Feature Summary

As a user, I would like to draw ROIs directly on the image widget. The shape of the ROIs could be a rectangle, a circle, an ellipse or a user-defined type (i.e. any of pyqtgraph's ROI objects). Once I have selected a ROI type, drawing on the the image item should start drawing the ROI. I would like to be able to select the ROI by clicking its border. Selecting a ROI should also be indicated visually. Once selected, I would like to be able to change its shape and remove it completely by pressing backspace or delete.

To simplify the management of multiple ROIs, another dialog should list all currently drawn ROIs and their current positions. A delete button would also simplify the deletion of ROIs.

From the CLI, I would like to be able to read the current positions of all ROIs, add / remove ROIs and set their positions.