- sender/receiver: reuse generated MqttUpdater
- base: added option "--verbose" to print stacktrace if any
- base: move mqtt default port definition to MqttUpdater
- base: add option in MqttUpdater to suppress welcome message
- starter: create 10 joints, use correct mqtt topics

- Example: add name to MqttUpdater
- Senderstub: replace MQTTSender with MqttUpdater
- Receiverstub: new component to observe topics and pretty-print sent protobuf objects

- Example: use Position class created by protobuf, use a wrapper in grammar instead for lists
- Example: manually extend Joint, currently only one connect
- Example: added generic MqttUpdater handling subscriptions
- Example: added some glue code, that would be generated normally
- Example: copied protobuf definition for linkstate
- SenderStub: new module with main to construct minimal linkstate and send it via mqtt