[FEATURE REQUEST] RAW: Expose max_raw_memory_mb setting

[JenusL]

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Is your feature request related to a problem? Please describe. We have some huge DNG-files that we're unable to develop with the default memory allocation in libraw.

Describe the solution you'd like I would like the imgdata.rawparams.max_raw_memory_mb in libraw to be exposed as a raw:max_raw_memory_mb setting.

Describe alternatives you've considered We have recompiled libraw with a higher default memory allocation to get around the problem but that isn't optimal.

Additional context We have tested it to make sure that this setting will actually solve our problem.

[lgritz]

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