* Serialize and load JSON Light .shadow property

* Add .toJSON() method to LightShadow
* Light .toJSON() writes .shadow property
* Parse .shadow property in DirectionLight and Spotlight JSON data

* Remove .castShadow condition when exporting .shadow property to JSON

I’ve added a handful of improvements that I think will really help
people trying to use Maya with 3JS:

1. The current plugin will only perform an “EXPORT ALL” regardless of
what you select from the menu in Maya. I have fixed that so you can now
“Export All” or “Export Selected”. Export all sill merges geometry
rather than exporting a 3JS scene, may fix that in the future.
2. Updated the default extension to be “.json” rather than “.js”. This
is more in-line with 3JS and the other exporters.
3. I pulled the JSON encoder from the Blender exporter and integrated
it into the Maya one so that each item in the ups, faces, vertices, etc
arrays are no longer on a separate line. Makes the file MUCH easier to
read and debug.
4. Turned off sorting of the JSON output. This is more of an opinion,
but I didn’t feel like it helped the output at all.

* Simplify and enhance PropertyBinding Regex

* Update Regex of PropertyBinding.

* Update regular expression of PropertyBinding

* Clean up VREffect

* Remove the space after function name

First usage of `updateStyle` with now indication of what or where it came from.

* adds toJSON methods to scene and fog objects

* adds toJSON method to FogExp2

* adds fog instantiation to ObjectLoader.parse

* adds type info to fog JSON serialization and loading

* fixes unresolved conflict from rebase

* Adds THREE.UnsignedInt248Type and THREE.DepthStencilFormat constants

* Extends DepthTexture to allow for either THREE.DepthFormat or THREE.DepthStencilFormat

* Extends depthTexture initialization to support both DepthTextureFormat and DepthStencilFormat

* Fixes typos

* Ensures correct internal format for DepthStencil textures

* Allows to set depthTexture via options.depthTexture in constructor

* 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.

1. Draw Non Selected objects in the depth buffer
2. Make non selected objects invisible, and draw only the selected objects, by comparing the depth buffer of non selected objects. Write a mask here for visible and hidden edges.
3. Downsample the Mask buffer to half
4. Edge detect the half res buffer, with different colors to hidden and visible edges.
5. Blur the edges of half res/quarter res buffer(quarter res is used for edge glow)
6. Add the blurred edges on top of original scene using the full res mask buffer

Changed the bevel so that it is elliptical instead of sinusoidal. Formatted both areas the same with the linear option in the comments.

Added `setWithCredentials` function to: ImageLoader, and TextureLoader which send the `withCredentials` variable to the XHRLoader. (#9391)

This will hopefully prevent other people making the same mistake as me (https://github.com/mrdoob/three.js/pull/9381#issuecomment-234625456)