* Added missing methods to docs / math

* Created doc for math / interpolant

* Added docs for maths / interpolants

* Revert "Added missing methods to docs / math"

This reverts commit d195954da59c7f93fd598db89b9420acce9e40c2.

* initial spherical docs

* Add the new page

* add Vector3.setFromSpherical docs

* adjust language and formatting

* Vector3.setFromMatrixColumn parameters reordered

* add Matrix[3|4].fromArray offset parameter

* document missing Box3.intersects* methods

* add missing Plane.intersects* methods

* add missing Sphere.intersects* methods

* document Color,setScalar method

* revise text

* add missing Vector*.setScalar methods

* adding the lerp to Math class #9728

Adding the precise  interpolation from point x to y using factor t.

* Adding the documentation for Lerp function

Adding the lerp in doc support

* Fix method link 'ReturnType's of all math object documentation

* Misc Documentation fixes

* Add intersectSphere() method to Ray docs

* Remove ?s in Ray documentation after return values

These are unique phenomenon in the current docs and don't seem to
indicate anything meaningful.

* Docs api math Vector4.html: miss a closing div tag

* Fix description of method equals in class Line3

x,y changed to x,y,z, and width,height changed to width,height and depth.

GitHub makes everything so easy these days!

* add Color.sub()

* add tab

* if result is negative set to 0

* revise doc of color.sub()

pedant mode on.

camera, core and math  dirs + a stray "]" in WebGLRenderer docs

* Remove arguments to allow optimalisations

* Change constructor based on @mrdoob's argument

* Fix issue with renaming of argument

* convert space to tabs

* cleanup docs

* don't forget the linefeed in docs

* docs cleanup

* Update Color.html

* ensure that an empty box is still an empty box aftering being transformed.

* fix docs to match new behavior.

* Documented Box3.applyMatrix4 doesn't work on empty boxes.

- See #8620

* Updated math Box classes' docs, style consistency.

* 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.

* add method docs

intersectsBox method not documented.

* correct isEmpty method name

correct isEmpty method name

intersectsBox method not documented.

* 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.

* Triangle: new method .closestPointToPoint

* better initialization of variables

* Matrix4: added preMultiply method

* Matri4: preMultiply -> premultiply

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