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Reduce memory usage

Henrik Gramner requested to merge gramner/dav1d:mem_usage into master

Up to 70% reduction in overall memory usage with 8-bit 4:2:0 and frame threading enabled.

This should cover the most impactful allocations.

There are perhaps a few more possible sumsampling-related improvements that could be looked into, and some palette code could be templated to be able to use pixel instead of uint16_t, but I think we can leave those for some other time.

Testing (especially obscure corner cases like changing bitdepth/resolution/sumsampling) welcome.

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