Allow transfers of address ownership

[ThijsNameIsTaken]

This is something that is probably gonna be for the long run, but it is still a handy feature to implement. For example, you bought an address for a team that you are in, and you bought it on your personal account at the beginning. If you later might want to have multiple addresses for the team, you could make a team account and move all addresses to there for better management.

[newbold]

Great idea. Definitely need a way to transfer ownership of addresses — just need to think through the workflow, but I'll add it!

[newbold]

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[newbold]

Tracking back here on GitHub.