[Feature Request] Preset for multiple exports with one click

[Garfounkel]

The new preset feature is really good however I often find myself exporting the same project multiple times with different preset to pick the best one.

It would be very useful to create a "preset of presets" that can export multiple files using different presets with one click. The filename could be set per preset using a template.

For instance I'd like to be able to create a preset "High Quality - pick the best one" with the following sub-presets:

Neural network: $filename$_nn.gif
FFmpeg - Higher quality: $filename$_ffmpeg.gif
Gifski - Higher quality: $filename$_gifski.gif