Merge remote-tracking branch 'origin/feature/7283_vsi_screenshot'
Refs #7161. Exposing the pqAxesToolbar widget.

This was installed on the same line as the color control widgets. Also, the
set center to point button moved with it. In addition, some adjustments were
made to the top row layout.
Refs #7161. Removing unneeded code.
Merge branch 'feature/7161_vsi_pick_center' into develop