For now, just interface settings for the stage control:
```
target/release/hostcontrol --help
Usage: hostcontrol [OPTIONS]
Options:
--stage-device <STAGE_DEVICE> Interface to talk to movement stage [default: /dev/ttyACM0]
--tty-speed <TTY_SPEED> Speed of the stage device (bps) [default: 115200]
-h, --help Print help
-V, --version Print version
```
Signed-off-by: Henner Zeller <h.zeller@acm.org>