Add blessed mode for reference tests#3062
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This adds a blessed mode to update/create reference images.
Usage is simple. Run
BLESS=1 cargo test.The implementation is also simple. Instead of writing changed/missing references to
tests/output, write them directly totests/referencesand don't error on changes. This also has the nice property that people can keep using the existing workflow of copying images fromtests/outputif they don't useBLESS=1.