Devicetree DTS and YAML format improvements (#492)

* **DevicetreeCompiler**
  * Binding properties now support default values.
  * Compiler returns meaningful exit codes and reports errors more clearly.
  * Stronger validation of device configurations with unified error handling.
  * Added integration tests and a dedicated Devicetree test workflow.

* **Changes**
  * Platform binding schemas updated: some fields made required, others gained explicit defaults.
  * Many device-tree files simplified by removing unused/placeholder pin and transfer-size entries.

* **Documentation**
  * Removed several outdated TODO items.

Buildscripts/DevicetreeCompiler/tests/data/bindings/test,device.yaml

@@ -0,0 +1,14 @@
+description: Test device binding
+compatible: "test,device"
+properties:
+  reg:
+    type: int
+    required: true
+  status:
+    type: string
+  boolean-prop:
+    type: boolean
+  int-prop:
+    type: int
+  string-prop:
+    type: string