Use webpack as preLaunchTask for debug launch

Author: gjsjohnmurray

.vscode/launch.json

@@ -12,7 +12,7 @@
 			"outFiles": [
 				"${workspaceFolder}/out/**/*.js"
 			],
-			"preLaunchTask": "${defaultBuildTask}"
+			"preLaunchTask": "npm: webpack"
 		}
 	]
 }