feat(cosmic-swingset): add board, use board in mailboxAdmin #1167
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Closes #1166
This PR adds the "board", a registry-like vat which allows users to add a value and get a key for that value. The key is a non-human-readable string and can be shared widely. Users can retrieve a value by giving the board the key. Keys and values are in a bidirectional one-to-one mapping. If a user attempts to add a value that has already been added, they get the old id.
This PR changes the mailbox vat to use the board rather than the registry.
Unit tests are added for the board, and tests of
home.board
andhome.mailboxAdmin
are also added.With this PR, users can now send and receive payments, but they can't use the wallet UI to do so yet. They can use deploy scripts or the REPL.