Revert "WebGLProperties: Made get() more WeakMap-ish."

Correct Reversed Reflection in Water2

Test manually updating video texture in webvr_video

move empty callbacks to prototype

GLTFExporter: Compare .name with empty strings for the consistency

BufferAttribute: Define default callback function on prototype instead of in constructor 

Matches Object3D and is more efficient

Remove optionalTarget - part 1

OrbitControls: pans with inertia when damping is enabled

exr piz wavelet decompression

MMDLoader: Optimize BufferAttribute type for skinIndex

remove uuid from BufferAttribute etc.

remove uuid from WebGLRenderTarget

GLTFExporter credits where it's due

Editor: Use RGBFormat when loading a jpg.

GLTFExporter: Export images as binary in GLB.

GLTFExporter Doc: Clean up image formats.

BufferGeometryUtils: Add mergeBufferGeometries() helper.