This reverts commit 0b3497f9.

* BufferGeometry cleanup

* Line cleanup

* Mesh cleanup

* Points cleanup

* Skeleton cleanup

* SkinnedMesh cleanup

* Box3 cleanup

* Color cleanup

* Matrix3 cleanup

* EdgesGeometry cleanup

* WireframeGeometry Cleanup

* Materials cleanup

* BoxHelper cleanup

* FaceNormals Helper cleanup

* SkeletonHelper cleanup

* VertexNormalsHelper cleanup

* PropertyBindings cleanup

* Add material option

* Local clipIntersection

* Updated Docs

* improving global/local clipping interaction

* intersection parameter update

* intersection shader fix

* removed commented code

* remove comment

* move is* properties to prototypes and remove unused ones

* rebuild

* merge dev -> less-is

* remove rebuild from PR

* convert to ES modules

* rebuild

* move shaders back into glsl files

* reinstate polyfills

* EventDispatcher: Deprecated .apply.

* EventDispatcher: Removed unit test for .apply.

* Implemented user-defined clipping planes.

* Renderer: Minor documentation update.

* Implements object-level clipping.

* Renderer: Minor cosmetic changes.

* Fixed lethal typo in normal shader.

* Let shadows respect .side of object's material.

* Fixed Plane.applyMatrix4.

- Scale denormalized but did not scale the position
- Projection is not supported (solved by documentation)
- Removed unnecessary copying to make up for the normalization
- Still arguably too heavy

* Added custom clipping example.

* Clipping: Fixed transition to disabled state.

* Improved custom clipping example.

- GUI dependency of volume visualization on Enabled state
- Larger radius for cylindrical global clipping area

* No .matrixAutoUpdate = false in clipping example.

* Let ShadowMap check renderer.localClippingEnabled.

* Added a simplified clipping example.

This reverts commit 644d6a21.

Conflicts:
	src/materials/Material.js