* Add psono json importer
Create types for psono export format
Add test files
Write tests for psono-json-importer
Write importer for psono export
Register 'psonojson' with `importOptions`
Import/register psono-json-importer with import.service
Add instructions on how to export from Psono
* Retain all imported data
Ensure all data is retained by adding unmapped properties into custom fields
Each item type has a set of mapped properties, anything not matching will be created as a custom field
Write extensive tests to ensure data is present
* Skipping GPG
We currently cannot import GPG Keys into notes or custom fields
* Add organizational test
Verify that folders get converted to collections when imported by an org
* Remove combined test-file (whole export)
* Remove redundant null type
