Adds signal handling for graceful shutdown via SIGINT and SIGTERM.
Updates the control loop to be interruptible, allowing for a clean exit when a shutdown signal is received.
Changes the node state management to use an enum for clarity and better control the run states (starting, running, stopping, stopped).
The heartbeat is stopped when the node is stopping or stopped.
Also updates the line request to force an inactive state when claiming the pin.
Also updates the version number.
Implements an automatic versioning system for the robot node,
utilizing a `version.txt` file and a Python script to increment
the patch version.
Integrates the version into the CMake build process to ensure
the version is displayed in the robot node's output.
Introduces a basic structure for the robot control node. This includes:
- A central brain component that manages the robot's logic.
- A state management system using a singleton to ensure thread-safe access to shared data.
- A simple main loop that can be started and stopped.
- Initial CMakeLists.txt and gitignore configurations.
This provides a foundation for implementing robot control logic.
