Phosphene 4.7.0 - a third of your peak memory back, same frames

A third of every render's peak memory was the MLX allocator's cache, and Phosphene never capped it. Now it does. Peak memory down about 35%. A Q4 768x432 121-frame render went from 25.53 GB to 16.50 GB on a 64 GB machine - and got slightly faster doing it (71.45s -> 68.84s). On a 16 GB Mac that same render sat at 101% of RAM. It now sits at 96%. That is the difference between swapping and running. The frames are sha256-identical to the uncapped render. This is not a quality trade - it is memory that was never doing any work. The cap sizes itself from your machine (1/8 of RAM, floor 2 GiB, ceil