2020-04-24 1.优化远程连接和控制，增加远程连接让用户等待的Loading提示。

JLChen

2020-04-24 126f59cbba2e1505c191b22c9794d810cdedb4c3

 Crabtree/SmartHome/UI/SimpleControl/MqttCommon.cs

@@ -78,7 +78,7 @@
            IfNeedReadAllDeviceStatus = true;
            bNeedStartTip = true;
            IsGatewayOnline = false;

            StartCloudMqtt ();
        }