OpenGL code in IbisImagePlaneMapper incompatible with current backend of VTK

[errollgarner]

IbisImagePlaneMapper makes use of deprecated OpenGL primitives (glBegin/End, glMatrixMode, etc.) which are incompatible with the version of OpenGL (3.2) used in our current version of VTK (9.0.1, but has also been since VTK 8.2). The class should be rewritten using more modern OpenGL programmable pipelines.