Recover ESP8266 build and ESPWifiManualSetup

#563  Move protocol change method outside of wifimanager scope
and correct build error for ESP8266

main/User_config.h

@@ -107,7 +107,6 @@ char mqtt_topic[mqtt_topic_max_size] = Base_Topic;
 char gateway_name[parameters_size * 2] = Gateway_Name;
 
 #if defined(ESP8266)||defined(ESP32) 
-  #include "esp_wifi.h"
   #define ATTEMPTS_BEFORE_BG  10 // Number of wifi connection attempts before going to BG protocol
   #define ATTEMPTS_BEFORE_B   20 // Number of wifi connection attempts before going to B protocol
 #endif
@@ -115,6 +114,7 @@ char gateway_name[parameters_size * 2] = Gateway_Name;
 // WIFI mode, uncomment to force a wifi mode, if not uncommented the ESP will connect without a mode forced
 // if there is a reconnection issue it will try to connect with G mode and if not working with B mode
 #ifdef ESP32
+  #include "esp_wifi.h"
   uint8_t wifiProtocol = 0; // default mode, automatic selection
   //uint8_t wifiProtocol = WIFI_PROTOCOL_11B;
   //uint8_t wifiProtocol = WIFI_PROTOCOL_11B | WIFI_PROTOCOL_11G; // can't have only one https://github.com/espressif/esp-idf/issues/702