MainWindow tied splitterMoved event

[Boris Barbulovski]

This patch makes both MainWindow splitters to move the same when one of
them is moved by the user.

In order to access QSplitter protected member, I had to subclass QSplitter
into new class.

I know this practice is not preferred, but should work for this scenario
just fine.

Maybe(in some future) I will create QGridSplitter widget, but until then,
this is the best solution.

br, Boris..
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