Provide built-in export UI for programs with limited UI options #23
Description
Currently implementing Inkscape support in #16 and coming up against an issue where there isn't any good way to procedurally supply a list of options for a menu, which makes it difficult to pick which format we want to export in.
It would be useful if there was an option to use a built in ui in conduct, which can be provided some basic data such as options for datablocks to export. On export, this will return an extra blob of arbitrary data, which is expected to be saved somewhere by the integration, and supplied during the next invokation of this dialog, as a way to save state