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/lichuang-dev/lichuang_dev_board.cc

@@ -1,11 +1,10 @@
 #include "wifi_board.h"
-#include "audio_codecs/box_audio_codec.h"
+#include "codecs/box_audio_codec.h"
 #include "display/lcd_display.h"
 #include "application.h"
 #include "button.h"
 #include "config.h"
 #include "i2c_device.h"
-#include "iot/thing_manager.h"
 #include "esp32_camera.h"
 
 #include <esp_log.h>
@@ -249,11 +248,6 @@ public:
         InitializeButtons();
         InitializeCamera();
 
-#if CONFIG_IOT_PROTOCOL_XIAOZHI
-        auto& thing_manager = iot::ThingManager::GetInstance();
-        thing_manager.AddThing(iot::CreateThing("Speaker"));
-        thing_manager.AddThing(iot::CreateThing("Screen"));
-#endif
         GetBacklight()->RestoreBrightness();
     }