This adds the `sysvmq` package which handles SysV IPC message queues.
For consistency the parameter for `permissions` is renamed to `mode`
also for POSIX message queues.
To supporte more than a single log level `log` and `env_logger` crates
are used. For the application to support the different type of
argument, the verbose argument definition was adapted.
Add support for timeout and deadline parameters when messages are sent
to a message queue. To keep code duplication small, the `utils.rs`
file contains a helper function to parse the `Duration` from the
`String` received from the timeout parameter. Add conflict rules for
the timeout and deadline parameters.
This subcommand receives one or more messages from a queue. Three
different methods are supported, read message by message, read until a
given timout or read until a specified date and time. This subcommand
also supports the `--non-blocking` flag.
The create command creates a new message queue with support of the
typical parameters `mode`, `capacity` and `msgsize`. This command also
supports the global argument `verbose`.
