Fix Windows uninstaller not removing files correctly

Multiple async tasks were not performed completely when running uninstaller.
So rearranged tasks with sequential order.
i.e. take care startup registry, finally call electron-squirrel-startup.

.eslintrc.json

@@ -1,7 +1,9 @@
 {
     "extends": "./.eslintrc-platform.json",
+    "parserOptions": {
+        "ecmaVersion": 2017
+    },
     "rules": {
-        "global-require": 1,
         "indent": [2, 2, {"SwitchCase": 0}],
         "no-console": 0,
         "no-eval": 1,