Implement command line argument passing for configuration.

[BabyCakes13]

Implement the configuration logic by command line arguments:

• ability to set sensor rate different for each sensor type (fixes Sensor read rate should be handled differently for each type. #7);
• set the MQTT broker's client and port;
  More tweaks will be added with this since we will have the configuration set up for when it's needed.

[BabyCakes13]

@alex-sever-h You suggested that we should rather implement this with MQTT requests. Can you detail? :)

[alex-sever-h]

Command line arguments are not necessary for an embedded device. It would be cumbersome to change them.
Better approach would be these:

1. Runtime settings through MQTT messages (configurations like polling rate, etc)
2. Web interface for setting more static configurations (MQTT server address, influxDB parameters, etc)