ModuleSlice now tells the color lookup table the correct data range.
Remove the ability to pan or scale the plane widget.

I am removing functionality from the widget that we don't need so that
the complexity of the class is reduced. Afterwards we will add in our
new features that we need.
Remove the cursor,text, and window leveling from the plane widget.
Remove the ability for the widget to spin.
Remove the ability to freely move the widget.
Setup a red background for slice to make it easier to detect what to remove.
ModuleSlice now compiles in debug mode as asserts are in the right scope.
Change the rotate implementation to be easy to understand.
PlaneWidget now clips section of the texture that lay outside the bounds.
cleanup some of the more hard to read section of vtkColorImagePlaneWidget
Make the plane have no box border when the user isn't picking it.
Updat the plane widget to use an arrow widget for rotation.