Add modified copy of PMREMGenerator, fix RoomEnvironment #1
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Adds a modified copy of PMREMGenerator.js from three.js r162, updated to use
WebGL extension 'OES_texture_float', not 'OES_texture_half_float'. The latter
in unsupported in headless-gl: stackgl/headless-gl#234.
All modified lines of PMREMGenerator annotated as shown below:
Alternative fixes would have been either (a) implementing 'OES_texture_half_float' in headless-gl, or (b) updating THREE.PMREMGenerator upstream to choose between the two extensions as needed, but since we're not ready to upgrade past three.js r162 anyway, this seemed like the cleanest workaround.