Add in support for clipping planes

tested to work with polydatamapper and glyph3dmapper

Change-Id: Ieb2f87e8cd17e04955b69c9eeab22d97533aaab5
Add back in the edge test

Change-Id: I28ba25b8142fef24013722ff631623e669e14e46
Merge topic 'add_clipping_planes' into master

b6087b7a Add back in the edge test
295ebc11 Add in support for clipping planes