Lucy Phipps b9e6d04558 Reduce size of PNG images
Use FileOptimizer 13.50.2431 (x86) and ZopfliPNG 1.0.2.

Update expected file hashes in tests.
2019-01-25 09:14:51 -05:00
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2018-08-16 11:56:08 -04:00
2019-01-25 09:14:51 -05:00