Kernel improvements (#468)

* **New Features**
  * Plugin-style modules for platforms and devices with start/stop lifecycle and a runtime-consumable device tree array.

* **Refactor**
  * Consolidated initialization into a kernel/module startup flow.
  * Generated devicetree artifacts moved to the build Generated directory.

* **Changes**
  * Removed legacy no-op registration hooks and I2C lock/unlock wrappers.
  * Driver ownership and private state moved to explicit module/owner model.
  * Added ERROR_NOT_ALLOWED error code.

TactilityKernel/Source/error.cpp

@@ -27,6 +27,8 @@ const char* error_to_string(error_t error) {
             return "out of memory";
         case ERROR_NOT_SUPPORTED:
             return "not supported";
+        case ERROR_NOT_ALLOWED:
+            return "not allowed";
         default:
             return "unknown";
     }