- Updated blockly_app to replace LED blocks with digital input/output blocks.
- Added digitalIn.js and digitalOut.js blocks for reading and writing GPIO states.
- Removed led_on.js and led_off.js blocks as they are no longer needed.
- Modified manifest.js to include new digital blocks.
- Enhanced blockly_executor to handle digital input and output commands.
- Created a new Hardware context class to manage dummy and real hardware modes.
- Implemented GPIO node for Raspberry Pi to handle digital input/output via gpiod.
- Added GpioWrite and GpioRead message definitions for communication between executor and GPIO node.
- Updated tests to cover new digital input/output functionality and removed old LED tests.
a2nr