feat(plugins): Add isStaff plugin (#25)

* feat(plugins): Add isStaff plugin

* fix(plugins/isStaff): Improve patches

src/plugins/isStaff.ts

@@ -0,0 +1,28 @@
+import { Devs } from "../utils/constants";
+import definePlugin from "../utils/types";
+
+export default definePlugin({
+    name: "isStaff",
+    description:
+        "Gives access to client devtools & other things locked behind isStaff",
+    authors: [Devs.Megu],
+    patches: [
+        {
+            find: ".isStaff=function(){",
+            replacement: [
+                {
+                    match: /(\w+)\.isStaff=function\(\){return\s*!1};/,
+                    replace: "$1.isStaff=function(){return true};",
+                },
+                {
+                    match: /return\s*\w+\.hasFlag\(.+?STAFF\)}/,
+                    replace: "return true}",
+                },
+                {
+                    match: /hasFreePremium=function\(\){return this.isStaff\(\)\s*\|\|/,
+                    replace: "hasFreePremium=function(){return ",
+                },
+            ],
+        },
+    ],
+});