RPC: Improve wallet_propose, deprecate wallet_seed:
* Add master_key, public_key and public_key_hex to wallet_propose's JSON response.
* Report an error if we can't understand wallet_propose's passphrase.
* Deprecate wallet_seed by adding a "deprecated" parameter directing the user to wallet_propose.
Add .unity suffix to unity sources
[WIP] Produce VS project in Sconstruct
Add .unity suffix to compiled files
[WIP]
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