Devicetree Visual Editor

Implemented a complete overhaul of the Devicetree Visual Editor.
The new editor replaces the old circuit views with a new Peripherals view, which gives an overview of the different components on your board, their pins, settings, and relationships.
There are a lot of additional changes and enhancements that we hope will reduce the learning curve for new Devicetree users and improve the workflow for existing users:
- The Devicetree View has been moved to its own Visual Studio Code sidebar.
- Removed the address bar at the top with a node-specific header.
- Diagnostics are now shown in the editor.
- Added a new Add Device workflow, making it easier to add new devices and features to your board.
- Pin assignments can now be dragged and dropped in the Pins view.
Implemented several small enhancements to how the changes made in the editor are applied to text files.
Fixed several bugs in property assignments and addition workflows.