Support decoding WEBPs in extended format #1168
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This adds support for decoding WEBPs encoded in extended format.
I added tests by copying the two test images in simple format, adding a VP8X chunk and appended an unknown chunk before and after the 'VP8 ' chunk to make sure the decoder correctly skipped unknown chunks and read the data from the VP8 chunk without going over.
The resulting decoded image is the same as the one from the files from the tests in simple format.
I license past and future contributions under the dual MIT/Apache-2.0 license,
allowing licensees to chose either at their option.