Support override script

Support proxies search

Add some scenes auto close connections

Update core

Optimize more details

lib/common/javascript.dart

@@ -0,0 +1,18 @@
+import 'package:flutter_js/flutter_js.dart';
+
+class Javascript {
+  static Javascript? _instance;
+
+  Javascript._internal();
+
+  JavascriptRuntime get runTime {
+    return getJavascriptRuntime();
+  }
+
+  factory Javascript() {
+    _instance ??= Javascript._internal();
+    return _instance!;
+  }
+}
+
+final js = Javascript();