GUI - Improve pan, zoom, etc. controls

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The pan, zoom and other interactions are a 
bit clunky at the moment (have to control click to get popup lists), as 
well as being duplicated across packages. Modernising them to behave a 
bit more like other interfaces would be good (box zooming, change the 
mouse to change the behaviour etc). They also take up a lot of real 
estate so could be converted to a drop down list or similar, or the 
options only show when the mouse hovers over the widget.

Original issue reported on code.google.com by zhoumich...@gmail.com on 6 Nov 2012 at 1:55

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