This module allows us to print messages to an output channel. Various forms of message are
supported. All the function names are prefixed with mbfl_message_. Almost all the messages
will have one of the forms:
<progname>: <message> <progname>: error: <message> <progname>: warning: <message> <progname>: debug: <message>
| • message config: | Message module configuration. | |
| • message plain: | Printing plain messages. | |
| • message format: | Printing formatted messages. |