Changelog

Refactors the application configuration
- Moves the CLI generator into src/cli.rs
- Moves all (most) remaining configuration from src/main.rs to src/config.rs
Reintroduces the local feed resync option via a CLI flag (defaults to false)
Exposes env vars for setting JSON-RPC server IP and port
Exposes env var for setting the network key to be used when attempting secret handshake with peer
- This makes it possible to run solar nodes on an alt net
Adds CLI printout to README, plus link to RPi build instructions and a list of available env vars for configuration

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