* Fix levels property name

* correct type of levels array contents

* correct spacing of method parameters

* Move legacy code to Three.Legacy.js

[This commit](https://github.com/mrdoob/three.js/commit/0f5e69cec8a13d9b9819565f04b5db466548538d#diff-96b1bdbd7110f611907545802eaa5805R913)  changed a `url_array` to `urls` which broke the loader + example page. This patches SceneLoader to use the same naming convention in other files.

Normals weren't properly transformed in last exporter change so they were flipped on their sides 90 degrees. This fixes that issue so lighting works as expected. (#8647)

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

* fix docs to match new behavior.

- See #8446

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

- See #8620

* Updated math Box classes' docs, style consistency.

Add high quality rand() function to common.glsl and an example to show off the noise textures. (#8603)

* create procedural glsl and an example to show off the noise textures.

* add to files.js

* adopt noise procedural in PMREMGenerator.

* fix page title per @arose's suggestion.

* more adoption of procedural.glsl

* remove procedural.glsl, add a single line to common.glsl.  Update other files as needed.

* cleanup shaders to use common.glsl

* tabify.

* avoid collapsing into a single function - @WestLangley recommendations

* more adoption of tabs.

* fix tabs.

sprite plugin: do not check texture.image, it allows to used textures created by RenderTarget (#8619)

* 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.

This helps when when the bounding box is not computed from an object, but comes from elsewhere

When Wrap Mode data is missing, fallback to Collada spec default repeated wrapping. Without this change the wrapping is clamped to edge which should not be the default behaviour.

* Examples: Fix Firefox error in "webgl_interactive_cubes_gpu"

* Revert "Examples: Fix Firefox error in "webgl_interactive_cubes_gpu""

This reverts commit f2130cc1afb18794ac30a7a85d69795e6b23dd40.

* WebGLRenderer: Ensure valid read requests in .readRenderTargetPixels

* remove ability to set depth formula on MeshDepthMaterial.

* remove depth formulas

* decouple PerspectiveCamera parameters in ObjectLoader. see comment: https://github.com/mrdoob/three.js/pull/8561/files/7eea5d47d86a6376175761cddab2742f17de177f#r59205742

* null -> undefined checking of data.view

* only export view if defined.

I noticed this was missing after updating from an older version of ColladaLoader.js. This fixes the face materialIndex not being set.