Netscape GIF extension belongs after the global color table #6211
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This was referenced May 14, 2022
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Helps #6207
When Pillow saves a GIF at the moment, the number of loops is specified as part of the local header for each frame.
It turns out this is incorrect.
https://web.archive.org/web/20140830100320/http://odur.let.rug.nl/~kleiweg/gif/netscape.html
So this PR moves it after the global color table when saving. I've also switched to only reading the number of loops from the first frame, instead of allowing it to potentially change with each frame.