This patch evaluates the radicle-node family of crates that emit logs.

They are each evaluated for their use of warn! and error! and whether these can be downgraded to a lower log level.

This will make the logs of the running radicle-node less busy and work towards surfacing only interesting information.

Changes:

• Remove target: "fetch" from radicle-fetch logs
• Reword "Error" messages to use "Failed to" instead
• Reword lack of signal handling for Windows
• Relocate radicle-fetch change into its proper commit

Small fixes, rebase.