Allow env OPENIMAGEIO_OPTIONS to set global OIIO::attribute() #2128
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Akin to how we have `OPENIMAGEIO_IMAGECACHE_OPTIONS` and `OPENIMAGEIO_TEXTURE_OPTIONS`. `OPENIMAGEIO_TEXTURE_OPTIONS` is a comma-separated list of name=val pairs that upon startup will seed the global options that are usually set by the OIIO::attribute() call. Along the way, I beefed up the OptParser to be able to handle both single and double quotes equally well. That lets you set an option that is a string, that itself contains quotes. Also document all of these options -- I realized the PDF docs don't talk about even the existing env variables.
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Akin to how we have
OPENIMAGEIO_IMAGECACHE_OPTIONSandOPENIMAGEIO_TEXTURE_OPTIONS.OPENIMAGEIO_TEXTURE_OPTIONSis a comma-separated list of name=val pairs that upon startup will seed the global options that are usually set by the OIIO::attribute() call.Along the way, I beefed up the OptParser to be able to handle both single and double quotes equally well. That lets you set an option that is a string, that itself contains quotes.
Also document all of these options -- I realized the PDF docs don't talk about even the existing env variables.