Include Server and SSL Manager settings on export/import

Currently, these are only available through API or the `backup` disk mode (full backup):
- SSL Manager (`/extensions/ssl/allStoreBytes` on the API)
- Server (`/server/publicSettings` on the API)

It would be great to have these exported and restored by Mirth Sync as well.

Bonus: have everything that's available on the `backup` disk mode also available the `code` disk mode.