Add Handle to parts.json

Author: lrockreal

parts.json

@@ -471,5 +471,13 @@
         "properties": {
             "QuantityRange": "string"
         }
+    },
+    "Handle": {
+        "extends": "Part",
+        "properties": {
+            "Swing": "number",
+            "TriggerMode": "number",
+            "ToolName": "string"
+        }
     }
 }