Feature Request - Add Mailing Address Management in cloudlog

[wafer-li]

Feature Background

Checking someone's mailling address in QRZ.com or other service will be tedious and require a lot of manual work.

Especially when you need to send a lot of QSL cards.

If the mailing address is stored and managed in cloudlog, it will relief the workload of checking the mailing address again and again.

Key Requirements

1. Dedicated page for Malling Address management of each callsign
2. Mailing Address Create, Edit, Delete
3. Search Address by callsign and text
4. Link callsign addresses to other callsign's, since the callsign could be different even if it is the same station. Such as XXX and XXX/QRP
5. Export the callsign and address as csv file with columns of "CALL, ADDRESS, ZIP_CODE"
6. Mailing Address update time and button to check callsign's QRZ.com and HAMQTH.com in case the address is expired.