Add a function `AreBaseParamsConfigured` and use this to check
before writing to the debug log. This avoids assertions when the
application happens to log too early, which happens in the GUI.
Messages logged before the base parameters are configured can be
shown using `-printtoconsole`.
This commit removes all the unnecessary dependencies (key, core,
netbase, sync, ...) from bitcoin-cli.
To do this it shards the chain parameters into BaseParams, which
contains just the RPC port and data directory (as used by utils and
bitcoin-cli) and Params, with the rest.
Michael Ford