Add the ability to specify an alternative Object3D to the camera to apply the pose coming from a VRDevice

GLTFExporter: Export textures as data URIs.

Fix typo and comma splice

GLTFLoader: Throw unhandled errors.

Examples: Manually manipulating morph targets on a model.

x file loader update

fix # 12599 unload xfiles.

. Apply structural loading. It corresponds to many X files.
.Separate file of model and animation can be load and bind animation.

use consistent language: hex => color

use consistent language: hex => color

fix typo: remove extra dot

remove duplicate text: domElement

fix copy-paste error: 0, 1 or 2 => 0, 1, 2 or 3

fix copy-paste error: Vector3 => Box3

fix copy-paste error: 2D => 3D

fix copy-paste error: models => images

consistent naming, hex => color

Remove unintelligible part of explanation

fix copy-paste error ParticleSystem => Particle

fix index error in example

fix typo Mixin => Mixing

remove duplicate verticesNeedUpdate