Add qt.natvis command & natvis files

* Update cppvsdbg template & Add visualizerFile

Change-Id: Iafdda679e38e6ac9e214151a83457550dcbc70f1
Reviewed-by: Marcus Tillmanns <marcus.tillmanns@qt.io>

package.json

@@ -42,6 +42,9 @@
     "onCommand:cmake.tasksBuildCommand",
     "onCommand:qt.kitDirectory",
     "onCommand:qt.minGWgdb",
+    "onCommand:qt.natvis",
+    "onCommand:qt.natvis5",
+    "onCommand:qt.natvis6",
     "onDebugResolve:cmake",
     "onDebugInitialConfigurations",
     "onDebugDynamicConfigurations:cmake",
@@ -147,6 +150,7 @@
               "program": "^\"\\${command:cmake.launchTargetPath}\"",
               "stopAtEntry": false,
               "cwd": "^\"\\${workspaceFolder}\"",
+              "visualizerFile": "^\"\\${command:qt.natvis}\"",
               "windows": {
                 "environment": [
                   {