refactor core_main, also fix windows flutter restart repeated fatal

error crash

flutter/lib/desktop/pages/server_page.dart

@@ -1,3 +1,5 @@
+// original cm window in Sciter version.
+
 import 'dart:async';
 
 import 'package:flutter/material.dart';

flutter/lib/models/server_model.dart

@@ -259,7 +259,6 @@ class ServerModel with ChangeNotifier {
   Future<Null> startService() async {
     _isStart = true;
     notifyListeners();
-    // TODO
     parent.target?.ffiModel.updateEventListener("");
     await parent.target?.invokeMethod("init_service");
     await bind.mainStartService();
@@ -274,7 +273,6 @@ class ServerModel with ChangeNotifier {
   /// Stop the screen sharing service.
   Future<Null> stopService() async {
     _isStart = false;
-    // TODO
     closeAll();
     await parent.target?.invokeMethod("stop_service");
     await bind.mainStopService();

flutter/pubspec.lock

@@ -49,7 +49,7 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.8.2"
+    version: "2.9.0"
   back_button_interceptor:
     dependency: "direct main"
     description:
@@ -147,7 +147,7 @@ packages:
       name: characters
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "1.2.1"
   charcode:
     dependency: transitive
     description:
@@ -168,7 +168,7 @@ packages:
       name: clock
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.1.1"
   code_builder:
     dependency: transitive
     description:
@@ -324,7 +324,7 @@ packages:
       name: fake_async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.0"
+    version: "1.3.1"
   ffi:
     dependency: "direct main"
     description:
@@ -418,8 +418,8 @@ packages:
     dependency: "direct main"
     description:
       path: "."
-      ref: "9021e21de36c84edf01d5034f38eda580463163b"
-      resolved-ref: "9021e21de36c84edf01d5034f38eda580463163b"
+      ref: "47179378523c993092f70d95f93d53f40af01f02"
+      resolved-ref: "47179378523c993092f70d95f93d53f40af01f02"
       url: "https://github.com/Kingtous/rustdesk_flutter_custom_cursor"
     source: git
     version: "0.0.1"
@@ -630,14 +630,14 @@ packages:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.11"
+    version: "0.12.12"
   material_color_utilities:
     dependency: transitive
     description:
       name: material_color_utilities
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.4"
+    version: "0.1.5"
   menu_base:
     dependency: transitive
     description:
@@ -651,7 +651,7 @@ packages:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.7.0"
+    version: "1.8.0"
   mime:
     dependency: transitive
     description:
@@ -728,7 +728,7 @@ packages:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.1"
+    version: "1.8.2"
   path_provider:
     dependency: "direct main"
     description:
@@ -980,7 +980,7 @@ packages:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.2"
+    version: "1.9.0"
   sqflite:
     dependency: transitive
     description:
@@ -1022,7 +1022,7 @@ packages:
       name: string_scanner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.1.1"
   synchronized:
     dependency: transitive
     description:
@@ -1036,14 +1036,14 @@ packages:
       name: term_glyph
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "1.2.1"
   test_api:
     dependency: transitive
     description:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.4.9"
+    version: "0.4.12"
   timing:
     dependency: transitive
     description: