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Add zooming in and out in call graph view

Donatas Mockus requested to merge aelliixx/kcachegrind:call-grapgh-zoom into master

This change allows the user to use 'ctr + mouse-wheel' to zoom in and out the call graph view. It also sets the maximum and minimum zoom level.

I find that the default scale for the call graph view has always been a little bit too large which results in a lot of panning around to see the flow of call stack. This is made much easier with the ability to zoom in and out.

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