* Separated out WebGLClipping.

* WebGLClipping: Named internal functions.

* Don't treat render targets like textures.

Expect Texture instances from now on. Added backwards compatibility
measures to ensure that render targets can still act as textures for the
time being. A deprecation warning will be given. Resolves #8615.

* Added comments to clear up RT-Cube detection.

* Revised the previously added comments.

* Added a TODO note.

Forgot to include this one in the last commit.

* Documentation: updated WebGLRenderTarget.

* Docs: added more Texture info to WebGLRenderTarget.

Also removed an unnecessary html line break.

* Docs: added a notification to ShaderMaterial.

WebGLRenderTarget and WebGLRenderTargetCube must not be used as
uniforms. Their texture instance must be used instead.

* Docs: revised a notification in ShaderMaterial.

* Removed useless and outdated ShadowMapPlugin docs.

* Consistified WebGLState, added culling.

* Let WebGLShadowMap set culling through WebGLState.

* WebGLShadowMap: Removed redundant state setup.

* WebGLRenderer: Removed needless factorization.

* Removed cull state mess from WebGLShadowMap.

- Instead flip .side on the depth material with the same effect.
- See #8760.

* Updated builds.

* merge bufferAttributeTypes with dev

* else if

* serialize the normalized flag

* update docs

* remove support for DataView as BufferAttribute source. This is to specific purpose, and geometry using this will break in too many other methods

* reimplement the DataView as a BufferAttribute data source

* try to warn when bufferAttribute contains a DataView and cannot be read

* Changed too many `warn` to `error`

* Code quality update in BufferAttribute datatype selection

* support load and save of normalized flag in BufferAttribute

* Check for DataView attribute buffers

* mend

* Revert "mend"

This reverts commit 1b4c87687d10fdaefd5007b98019b25d33c492e1.

* try to fix after --ammend causes conflicts

* working on cleaning this all up

* More whitespace cleanup

* more code style cleanup

* strike OBE comment

* more spacing cleanup

* 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.

* 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

* WebGLProgram: Rewrote uniform name parser.

* Revised structured uniforms.

- Allowed arbitrary nesting
- Removed map iteration

* working on depth texture

* working on depth texture

* support depth texture in webgl1 and webgl2

* fix comments

* reset build to avoid diff noise

* add check for webgl2 context

* fix depth texture example

* animation for example

* add file

* add depthTexture to WebGLRenderTarget

* ensure depth format returns correct GL parmaeter

* use null for initial depthTexture value

* add some commented out code

* 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.

* Reintroduce MeshPhysicalMaterial

* Reintroduce MeshPhysicalMaterial

* Simplified conditionals

Fix #8358

Fix for geometry.maxInstancedCount == 0

WebGLRenderer: loadUniformsGeneric() back to if statements. Chrome seems to be continuously deoptimizing the function. Maybe helps with #8220.