* 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

* Fix Matix4 applyToBuffer

`BufferAttribute.setXYZ` was missing `index` argument.

* Fix Matrix3 applyToBuffer

* add offset to fromArray for consistency with all other fromArray functions in the ThreeJS math library.

* Added matrix3/fixed whitespace

* Fix Matrix3 Matrix4 getInverse throwOnDegenerate

* Update throwOnDegenerate assertion

* 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

* Speedup Matrix inverse

* Matrix4 invert speedup

* MatrixN: Deprecated .flattenToArrayOffset.

Instead .toArray consistently allows array and offset to be passed.

* Updated math classes' docs .toArray / .fromArray.

* Automated uniform.<name>.type.

* WebGLRenderer: Added .setTexture deprecation stub.

* Updated ShaderMaterial docs, uniform types.

* Updated Quaternion docs .toArray / .fromArray.

* Updated Quaternion docs, static .slerpFlat.

* Updated math classes' docs, style consistency.

* Updated ShaderMaterial docs, style consistency.

- Also linearize memory access in set.

Note: Allows in-place inversion, e.g. `m.getInverse( m )`.

The previous flag is incorrectly named. The flag is supposed to signify a
degenerate matrix. Fixes issue #7612.

- Better inheriting of `clone` + `copy` methods where appropriate. This is done by calling `new this.constructor()` in parent classes. `this.constructor` refers to the current instance's constructor, so it should all compose nicely;

- Pass in attributes directly as arguments to constructor when cloning, where appropriate (if arguments pattern is different from parent class). This mean `copy` isn't relied on to set those attributes.

- Change order of `clone` in some files (for better visibility into its relationship with `copy`, and to maintain consistency; can return to previous order if necessary);

- Fix CubeTexture's clone method

Changed some examples to use SphereBufferGeometry
Added coord getters to Buffers
Changed Matrix apply to work with both Interleaved and Regular Buffers

add THREE.error/THREE.warning to allow for easy redirection of THREE.js specific errors and warnings.

Implemented Geometry2.merge().
Added offset and length parameters to Matrix3/Matrix4.applyToVector3Array().