plug-ins: gAMA chunk export is now a redundant option.
Now when a gAMA chunk is set on an imported PNG (and if there is no profile attached), an equivalent profile is created out of the gAMA chunk. So the displayed image looks like it is supposed to. On export, the generated profile should simply be saved together in the PNG file. If not, the sRGB chunk is set anyway (and also an equivalent gAMA/cHRM as recommended in the specs). So basically we now have a proper support of the gAMA chunk, from import to export, and display within GIMP takes this metadata into account appropriately (in the shape of a generated equivalent profile). Therefore it looks to me keeping the option is redundant. It is even confusing (because it's actually hard to understand exactly what this data is about, even our documentation about this metadata seems to be wrong) hence possibly dangerous if someone thinks it is important, checks the box, which would override other data or simply create irrelevant or contradictory metadata. So let's just remove this option. Development releases are the right places anyway for people to notice this change and come to us if we missed some usage regarding this option. See also #5363.
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