Add password_command for sasl and nick_password
#583
Merged
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This commit builds off of #552 and allows the user to supply a command instead of a password file anywhere that a password file is used. If the password command ends unsuccessfully, then an error is displayed.
Trailing whitespace is now trimmed from password commands, as it is commonplace for commands to leave a trailing newline after the password they output.
Resolves #580