feat: legacy wallet migration

BREAKING CHANGE: begin work on legacy import ...

This also changes the name of the local storage keys for the master
password salt and tester, which means existing master passwords will
have to be set up again. Wallet storage should still be intact, as long
as the password is the same.

feat: add tips card

chore: update license information

feat: name purchase modal

refactor: remove react import (react v17)

fix: move SyncWork (fixes #10)

feat: broadcast wallet edits across tabs

feat: near completion with v1 backup importing

refactor: import aliases

feat: transaction page

refactor: extract tx summary, fix redux, new hook

feat: search results nav, keyboard shortcut ...

Also implements half of the address page, adds a hook for the syncNode,
and some other miscellaneous refactors.