multi: Refactor wallet.NetworkBackend. #2320
Merged
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This unifies the wallet's Peer and NetworkBackend interfaces into a single interface, given the SPV peer syncer now fulfills both roles.
In order to complete the refactor, the following changes are made:
In the future, the dependency on concrete type checking could be further reduced on other call sites by using the same technique that was employed in this commit for the deployments package.
Close #2317.