Fix processing of the default_password setting. It is now actually used as the plaintext password for new users. Also add /setpassword and /clearpassword server commands that can be used by admins with the PRIV_PASSWORD privilege, and update the /help message.

Create the necessary API for /giveme and /give and implement those commands; also sort out the scripts a bit

commands:
/#ipban <nick>
/#ipunban <ip>

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extra : rebase_source : 7260636295d9068fbeeddf4143c89f2b8a91446c