Pre-compute lookup tables when parsing SOGS files #159
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SOGS files are loaded from images with 8-bit channels. This means that for many of the properties there are only 256 distinct values. Since
numSplats>> 256, it can be beneficial to (pre)compute a lookup table and use it. This PR implements lookup tables for the scales, quaternions, RGBA and spherical harmonics properties.Testing with the sutro.zip the parsing is a modest ≈10% faster with these changes.