ColladaExporter: Convert vertex, material colors to sRGB before export #23400
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Related issue: #23283
Description
Converts material colors (diffuse, emissive, specular color) and vertex colors to sRGB before exporting as a Collada file. It looks like vertex color export wasn't actually working correctly so this fixes that up, too, by correctly declaring vertex color accessors as R, G, B, and always writing colors as float values.
Tested by exporting the vertex-colored teapot from the exporter and loading it in the Collada loader example. Relatedly the ColladaLoader doesn't looks like it actually sets material.vertexColors = true anywhere so that needs to be set manually on load to test.