[BLUFI] Add Blufi activation and deactivation at runtime (#2058)

Co-authored-by: Florian <1technophile@users.noreply.github.com>

main/User_config.h

@@ -648,6 +648,7 @@ enum PowerMode { DEACTIVATED = -1,
 struct SYSConfig_s {
   bool mqtt; // if true the gateway will publish the received data on the MQTT broker
   bool serial; // if true the gateway will publish the received data on the SERIAL
+  bool blufi; // if true the gateway will be accesible with blufi
   bool offline;
   bool discovery; // HA discovery convention
   bool ohdiscovery; // OH discovery specificities
@@ -663,6 +664,9 @@ struct SYSConfig_s {
 #ifndef DEFAULT_SERIAL
 #  define DEFAULT_SERIAL false
 #endif
+#ifndef DEFAULT_BLUFI
+#  define DEFAULT_BLUFI true
+#endif
 #ifndef DEFAULT_OFFLINE
 #  define DEFAULT_OFFLINE false
 #endif