Calculate the axis label positions.

Instead of using hard coded values for the label and title positions on
cubeAxesActor, calculate them.
This development is needed to correctly display oriented labels on axes.
I did my best to obtain a result as near as possible to the current result,
for non oriented labels.

Change-Id: I99d0b76b5e9228125ca0205ca8a63a641239d5f0
Merge topic 'axis-actor-label-position' into master

009b5ac2 Calculate the axis label positions.