v1.8.0: Audio 代码重构与低功耗优化 (#943)

* Reconstruct Audio Code

* Remove old IoT implementation

* Add MQTT-UDP documentation

* OTA升级失败时，可以继续使用

main/boards/df-k10/config.json

@@ -4,8 +4,7 @@
         {
             "name": "df-k10",
             "sdkconfig_append": [
-                "CONFIG_SPIRAM_MODE_OCT=y",
-                "CONFIG_IOT_PROTOCOL_MCP=y"
+                "CONFIG_SPIRAM_MODE_OCT=y"
             ]
         }
     ]

main/boards/df-k10/df_k10_board.cc

@@ -7,7 +7,6 @@
 #include "application.h"
 #include "button.h"
 #include "config.h"
-#include "iot/thing_manager.h"
 #include "esp32_camera.h"
 
 #include "led/circular_strip.h"
@@ -258,11 +257,6 @@ public:
         InitializeButtons();
         InitializeIot();
         InitializeCamera();
-
-#if CONFIG_IOT_PROTOCOL_XIAOZHI
-        auto& thing_manager = iot::ThingManager::GetInstance();
-        thing_manager.AddThing(iot::CreateThing("Speaker"));
-#endif
     }
 
    virtual Led* GetLed() override {