This refactor splits the import and export functionality out of the ImportContext and adds an ExportContext. This also introduced separate importer and exporter implementations.
Additionally, adding archive, save, scripts, and server files to the final export archive has been implemented at the exporter implementation for each instead of handling it in the context. This should be a good pattern if other files need to be added down the road.
Had to remove the responsibility of providing the current version of the application from UpdateService. A new IVersionProvider can be used to get the version. This also allows for this to be mocked in tests.
