examples/analyzer.cc is displaying frames out of order

[negge]

Since the b-frame patch landed dd604a08694fa70b28b0f0888a83dede78c1ee90 the frame decode order is not the same as the frame display order. This needs to be fixed by adding code to decode the whole video (including caching all decctl metadata) and advancing it in the display order.

https://people.xiph.org/~unlord/nums.y4m