The save dialog could have an option to choose which output format to use (from a list of supported formats) for a Segmentation

[jadh4v]

          Don't know if its worth it, but I think the save dialog could have an option to choose which format to use (from a list of supported formats)? Another option is to just be able to modify the default from `Settings` tab.

Originally posted by @jadh4v in #527 (comment)

[PaulHax]

Lets talk about that here: #529