Standard Notes importer improvements

[AdamXweb]

A few notes importing from Standard Notes:

• Tags aren't imported
• Supernotes aren't handled at all.
• Can't seem to see any attachments being imported at all too

An alternative step for the importer could change to the following:

• Select all notes
• Right click and export (This converts super notes to markdown) + exports images into folders
• Import to the importer (This step would need adjustment to recognise the frontmatter date created as well as URLs for attachments)

However, the downside to this is most standard markdown or txt notes don't have frontmatter or any meta

Would be good to have an easier way to import from StandardNotes