Add render tests for Primitive in 2D and Columbus view.
Add rendering tests for box, circle, and ellipse geometry. Fix ellipse bounding sphere when at a height above the ellipsoid.
Add ellipsoid, extent, and polygon rendering tests. Fix polygon bounding sphere at a height above the ellipsoid.
Add wall geometry rendering test.
Add simple polyline geometry rendering tests.
Add custom primitive rendering tests.
Revert changes to CesiumViewe.
Updates based on review.
More updates based on review.
Merge branch 'batching' into sphereGeometry