Use Typed Arrays for the send queue

This commit converts the send queue to use typed arrays, and converts
message creation functions in 'rfb.js' to create messages directly into
the socket's send queue.  This commit also removes the separate mouse array,
which is no longer needed.

tests/fake.websocket.js

@@ -51,14 +51,9 @@ var FakeWebSocket;
         },
 
         _get_sent_data: function () {
-            var arr = [];
-            for (var i = 0; i < this.bufferedAmount; i++) {
-                arr[i] = this._send_queue[i];
-            }
-
+            var res = new Uint8Array(this._send_queue.buffer, 0, this.bufferedAmount);
             this.bufferedAmount = 0;
-
-            return arr;
+            return res;
         },
 
         _open: function (data) {