merge new qcloud sdk

1. qcloud has a great revolution, the protocol has been changed to implement data template, so the old TencentCloud_SDK developed by us will not work fine now(mqtt still works, but data template will not works fine for recently created product/devices).

2. I merge the official qlcoud sdk(include both the iot-hub and iot-explorer sdk) into the componet/conectivity to support new protocol of data template

3. iot-hub sdk, supply the fundamental iot protocol(like mqtt coap, etc.)
iot-explorer sdk, supply the high level service like data template based on mqtt

4. To know how it works, see qcloud_iot_explorer_sdk_data_template、qcloud_iot_hub_sdk_mqtt example(keil project in board\TencentOS_tiny_EVB_MX_Plus\KEIL\qcloud_iot_explorer_sdk_data_template and  board\TencentOS_tiny_EVB_MX_Plus\KEIL\qcloud_iot_hub_sdk_mqtt)

components/connectivity/qcloud-iot-hub-sdk-3.1.2/3rdparty/sdk_src/utils/utils_timer.c

@@ -0,0 +1,44 @@
+/*
+ * Tencent is pleased to support the open source community by making IoT Hub available.
+ * Copyright (C) 2016 THL A29 Limited, a Tencent company. All rights reserved.
+
+ * Licensed under the MIT License (the "License"); you may not use this file except in
+ * compliance with the License. You may obtain a copy of the License at
+ * http://opensource.org/licenses/MIT
+
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is
+ * distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+ * either express or implied. See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+    
+#include "utils_timer.h"
+    
+bool expired(Timer *timer) {
+    return HAL_Timer_expired(timer);
+}
+
+void countdown_ms(Timer *timer, unsigned int timeout_ms) {
+    HAL_Timer_countdown_ms(timer, timeout_ms);
+}
+
+void countdown(Timer *timer, unsigned int timeout) {
+    HAL_Timer_countdown(timer, timeout);
+}
+
+int left_ms(Timer *timer) {
+    return HAL_Timer_remain(timer);
+}
+
+void InitTimer(Timer *timer) {
+    HAL_Timer_init(timer);
+}
+    
+#ifdef __cplusplus
+}
+#endif