This is mostly hooking up gl calls to look inside the wrapper.
A few other things have changed.
Spector metadata is set the new way.
`Frame` changed `glTexture` to a getter, simplifying bookkeeping.
`LightPipeline` and `Plane` use standard methods to create textures.
`WebGLRenderer` maintains a list of wrappers, and automatically
manages it through `createTexture2D` and `deleteTexture`. The update
methods `updateCanvasTexture` and `updateVideoTexture` have been
delegated to the wrapper.
* The `WebGLRenderer.currentActiveTexture` property has been removed.
* The `WebGLRenderer.startActiveTexture` property has been removed.
* The `WebGLRenderer.tempTextures` property has been removed.
* The `WebGLRenderer.textureZero` property has been removed.
* The `WebGLRenderer.normalTexture` property has been removed.
* The `WebGLRenderer.textueFlush` property has been removed.
* The `WebGLRenderer.isTextureClean` property has been removed.
* The `WebGLRenderer.setBlankTexture` method has been removed.
* The `WebGLRenderer.setTextureSource` method has been removed.
* The `WebGLRenderer.isNewNormalMap` method has been removed.
* The `WebGLRenderer.setTextureZero` method has been removed.
* The `WebGLRenderer.clearTextureZero` method has been removed.
* The `WebGLRenderer.setNormalMap` method has been removed.
* The `WebGLRenderer.clearNormalMap` method has been removed.
* The `WebGLRenderer.unbindTextures` method has been removed.
* The `WebGLRenderer.resetTextures` method has been removed.
* The `WebGLRenderer.setTexture2D` method has been removed.
* The `WebGLRenderer.pushFramebuffer` method has had the `resetTextures` argument removed.
* The `WebGLRenderer.setFramebuffer` method has had the `resetTextures` argument removed.
* The `WebGLRenderer.popFramebuffer` method has had the `resetTextures` argument removed.
* The `WebGLRenderer.deleteTexture` method has had the `reset` argument removed.
* The `WebGLRenderer` has 4 new properties: `maskTargetFramebuffer`, `maskSourceFramebuffer`, `maskTargetTexture` and `maskSourceTexture`. These are the new global locations of the mask framebuffers.
* `WebGLRenderer.createBitmapMask` is a new method that internally creates the Bitmap Mask framebuffers.
* `WebGLRenderer.clearBitmapMask` is a new method that internally clears the existing Bitmap Mask framebuffers, called as part of a resize event.
* `WebGLRenderer.enableBitmapMask` is a new method that starts the process of using the mask target framebuffer for drawing. This is called by the `BitmapMaskPipeline`.
* `WebGLRenderer.drawBitmapMask` is a new method that completes the process of rendering using the mask target framebuffer. This is called by the `BitmapMaskPipeline`.