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This change is in preparation to [PR 10788]. PR 10788 will make the shell exitable which may lead to unexpected behavior in comparison to previous usage of the shell. To prevent this, this PR introduces two "new" functions to the shell's API: `shell_run_once()` and `shell_run_forever()`. `shell_run_once()` basically has the same behavior as `shell_run()` in current master: Start a shell and continue reading lines until EOF is reached. `shell_run_forever()` wraps around `shell_run_once()` and restarts the shell if it exits. `shell_run()` is re-introduced as a back-porting alias for `shell_run_forever()`. As a consequence all current calls to `shell_run()` won't exit even with [PR 10788] merged (which would add EOT as additional exit condition for `shell_run_once()`). [PR 10788]: https://github.com/RIOT-OS/RIOT/pull/10788