Basic first steps to a modified ear clipping tessellator.
Working now in coords local to each feature part.
Adding hole support for polygons.
CMake update.
Improved hole handling in the tessellator.
Moved Tessellator from Util to Features.
Moved tessellator from osgeEarthFeatures to to core osgEarth.
Merge branch 'master' into topic_tessellator
Added tessellator support for multiple primitive sets.
Merge branch 'topic_tessellator'