Added mutex + fixed rare duplicate chats bug + fixed connect bug

The mutex will prevent duplicate functions from being called and throwing funky errors.

src/WAConnection/Mutex.ts

@@ -0,0 +1,24 @@
+/**
+ * A simple mutex that can be used as a decorator. For examples, see Tests.Mutex.ts
+ * @param keyGetter if you want to lock functions based on certain arguments, specify the key for the function based on the arguments
+ */
+export function Mutex (keyGetter?: (...args: any[]) => string) {
+    let tasks: { [k: string]: Promise<void> } = {}
+    return function (_, __, descriptor: PropertyDescriptor) {
+        const originalMethod = descriptor.value
+        descriptor.value = function (this: Object, ...args) {
+            const key = (keyGetter && keyGetter.call(this, ...args)) || 'undefined'
+
+            tasks[key] = (async () => {
+                try {
+                    tasks[key] && await tasks[key]
+                } catch {
+
+                }
+                const result = await originalMethod.call(this, ...args)
+                return result
+            })()
+            return tasks[key]
+        }
+    }
+}