Auto create dataDir on preEnable

If the extension is upgraded the install will be skipped, but the
uninstall will be called.  Uninstall will delete the dataDir, and
subsequent calls will fail.  Ensure this directory always exists.

misc/HandlerManifest.json

@@ -8,6 +8,6 @@
     "disableCommand": "bin/custom-script-shim disable",
     "rebootAfterInstall": false,
     "reportHeartbeat": false,
-    "updateMode": "UpdateWithoutInstall"
+    "updateMode": "UpdateWithInstall"
   }
 }]