Bump Three.js to r147

[takahirox]

Major benefits

• For glTF GPU instancing support
• For better glTF LOD support
  • More precisely, this upgrade includes some changes needed for upcoming better glTF LOD support.

Breaking changes

• Drop glTF KHR_materials_pbrSpecularGlossiness extension support

https://github.com/mrdoob/three.js/wiki/Migration-Guide

Changes in the Hubs Client code base

• Rename uniform.luminance to uniform.luminanceSky in skybox.js to avoid uniform luminance redefinition in the shader
  • They renamed linearToRelativeLuminance() to luminance() in common shader Shaders: Renamed linearToRelativeLuminance() function mrdoob/three.js#24347
• Rename *BufferGeometry to *Geometry to match the latest Three.js API
• Rename Scene.autoUpdate to Scene.matrixWorldAutoUpdate to match the latest Three.js API

Dependencies

• Some dependencies seem to use Three.js *BufferGeometry. But Three.js has fallback now. It warns but *BufferGeometry keeps working. I would like to suggest the warnings for now.
• @types/three doesn't seem to support r147 yet. Using r146 instead. There doesn't seem to be any problems so far.
• Upgrade our Three.js fork to r147 and named the branch hubs-patches-147
  • Applied some upcoming changes to GLTFLoader that will be applied in r148 because they are needed for better LOD support. See https://github.com/MozillaReality/three.js/commits/hubs-patches-147
• postprocessing doesn't support r147 yet. It supports up to r146 and blocks r147 install. As a workaround, I made a fork allowing r147 for now. It doesn't seem to cause any problem so far.
• Similarly A-Frame blocks to install r147. It seems to be needed Three.js upgrade in it Bump Three.js to r147 aframe#38

TODO

• Merge A-Frame Three.js upgrade PR and update the package.json and package-lock.json

[takahirox]

Switched to draft. Currently the latest Three.js release is r152. It doesn't really make sense to upgrade to older revision (r147). When we upgrade Three.js next time, we can upgrade to the latest one. We might reuse this PR or branch because the changes in this PR will be needed anyways.