fix: WebSocketTransport Re-use and Compatibility (#188)

* fix:Unity WebGL throws Error: "ReferenceError: Runtime is not defined"

It seams that in unity 2021.2 variable Runtime doesn't exist and can be replaced with Module['dynCall_*'].
In webSocket.jslib change all Runtime.dynCall('*1', *2, [*3, *4]) for Module['dynCall_*1'](*2, *3, *4)

* Updated web socket transport to not use static fields

* Reset started value on disconnect

* Fixed the flag for is started on shutdown

* Reset web socket client on shutdown

* Added catch statement to close socket

* Changed close on already closed to end quietly

* Fixed some errors with web socket client

* Fixed small syntax error

Transports/com.community.netcode.transport.websocket/Runtime/JSWebSocketClient.jslib

@@ -39,7 +39,7 @@ var LibraryWebSocket = {
       }
 
       if (state.onOpen) {
-        Runtime.dynCall('v', state.onOpen, []);
+        Module['dynCall_v'](state.onOpen);
       }
     };
 
@@ -59,7 +59,7 @@ var LibraryWebSocket = {
         HEAPU8.set(dataBuffer, buffer);
 
         try {
-          Runtime.dynCall('vii', state.onMessage, [buffer, dataBuffer.length]);
+          Module['dynCall_vii'](state.onMessage, buffer, dataBuffer.length);
         } finally {
           _free(buffer);
         }
@@ -78,7 +78,7 @@ var LibraryWebSocket = {
         stringToUTF8(msg, msgBuffer, msgBytes);
 
         try {
-          Runtime.dynCall('vi', state.onError, [msgBuffer]);
+          Module['dynCall_vi'](state.onError, msgBuffer)
         } finally {
           _free(msgBuffer);
         }
@@ -91,7 +91,7 @@ var LibraryWebSocket = {
       }
 
       if (state.onClose) {
-        Runtime.dynCall('vi', state.onClose, [ev.code]);
+        Module['dynCall_vi'](state.onClose, ev.code)
       }
     };
   },

Transports/com.community.netcode.transport.websocket/Runtime/NativeWebSocketClient.cs

@@ -70,7 +70,7 @@ public void Close(CloseStatusCode code = CloseStatusCode.Normal, string reason =
 
             if (ReadyState == WebSocketSharp.WebSocketState.Closed)
             {
-                throw new InvalidOperationException("Socket is already closed");
+                return;
             }
 
             try

Transports/com.community.netcode.transport.websocket/Runtime/WebSocketClientFactory.cs

@@ -10,8 +10,8 @@ namespace Netcode.Transports.WebSocket
 {
     public class WebSocketClientFactory
     {
-#if UNITY_WEBGL
-        public static JSWebSocketClient Client = new JSWebSocketClient();
+#if (UNITY_WEBGL && !UNITY_EDITOR)
+        public static JSWebSocketClient Client;
 
         internal delegate void OnOpenCallback();
         internal delegate void OnMessageCallback(IntPtr messagePointer, int messageSize);
@@ -67,7 +67,8 @@ internal static void OnCloseEvent(int disconnectCode)
 
         public static IWebSocketClient Create(string url)
         {
-#if UNITY_WEBGL
+#if (UNITY_WEBGL && !UNITY_EDITOR)
+            Client = new JSWebSocketClient();
             _SetUrl(url);
             _SetOnOpen(OnOpenEvent);
             _SetOnMessage(OnMessageEvent);

Transports/com.community.netcode.transport.websocket/Runtime/WebSocketTransport.cs

@@ -8,9 +8,9 @@ namespace Netcode.Transports.WebSocket
 {
     public class WebSocketTransport : NetworkTransport
     {
-        private static WebSocketServer WebSocketServer = null;
-        private static IWebSocketClient WebSocketClient = null;
-        private static bool IsStarted = false;
+        private WebSocketServer WebSocketServer = null;
+        private IWebSocketClient WebSocketClient = null;
+        private bool IsStarted = false;
 
         [Header("Transport")]
         public string ConnectAddress = "127.0.0.1";
@@ -101,6 +101,7 @@ public override void Shutdown()
             {
                 WebSocketServer.Stop();
             }
+            IsStarted = false;
         }
 
         public override bool StartClient()