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  * Removed several outdated TODO items.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/test.dts

@@ -0,0 +1,17 @@
+/dts-v1/;
+
+#include <test_include.h>
+
+/ {
+    compatible = "test,root";
+    model = "Test Model";
+
+    test_device: test-device@0 {
+        compatible = "test,device";
+        reg = <0>;
+        status = "okay";
+        boolean-prop;
+        int-prop = <42>;
+        string-prop = "hello";
+    };
+};