WebGLRenderer: Extensions code clean up. Need to refactor this so we get the extension only when needed...
WebGLRenderer: Set _currentGeometryGroupHash to -1 after deallocating geometry just in case (temporal hack). Fixes #5421.
Moved Projector's .projectVector and .unprojectVector to Vector3 .projectCamera and .unprojectCamera.
This may help on GC and/or be VM friendlier.
Compressed textures with a single mip level have to use Linear min filter, instead of the default Mip filter.
This fixes colada keyframe example but breaks helpers. Time to refactor Helpers...