Allow user to save export-settings

self explicit from topic
Let user have a list of named setting-setups for project export
Could be some users sometimes like to export in HQ, other times file-size is most important, and they like a setting that create just that.
A list of named saved settings, could be useful in that respect.

No files, tests, or entry points are named. Start by locating the export-settings UI and persistence flow, then define how named setting sets are created, selected, and applied; the feature is done when users can save and reuse distinct export configurations.

Written by the indexing model from the issue text.