Update style for the 2D inspection tool.
Change titles of render widgets.
Change height values for render properties.
Refactor method name.
Improve management of transformation tabs.

Now it saves the last shown tab switching to the transformation tab.
When transformation is dismissed, this tab will be activated.
Improve layout of info widget.

Also add data scalar type. Histogram now has a standard height. Added
scroll area.
Change layout parameters.
Remove last transformation instead of selected transformation.

Also add tooltip to button.
Do not draw focus rectangle around list.
Do not draw focus rectangle around hist list view.
Remove parameter edit view of manual transform tool.

This helps in removing clutter for the user.
Improve layout of multi volume visualization parameters

Remove some unneeded / unwanted parameters and group the opacity
sliders together.
Change name of tab.
Change order of tabs of render properties.
Fix for polygon of histogram protruding underneath the histogram.
Ignore scroll events so the histogram works in scroll areas.
Remove comment.
Updated style of landmark point widget.
Refactor.
Remove unused method.