Set WifiManager debug level. (#1014)

This allows for setting the WiFimanager debug level for more or less verbosity using the WM_DEBUG_LEVEL macro.
Valid values are:
        DEBUG_ERROR     = 0,
        DEBUG_NOTIFY    = 1, // default
        DEBUG_VERBOSE   = 2,
        DEBUG_DEV       = 3,
        DEBUG_MAX       = 4

main/User_config.h

@@ -106,6 +106,9 @@ const byte mac[] = {0xDE, 0xED, 0xBA, 0xFE, 0x54, 0x95}; //W5100 ethernet shield
 #ifndef WifiManager_TimeOut
 #  define WifiManager_TimeOut 5
 #endif
+#ifndef WM_DEBUG_LEVEL
+#  define WM_DEBUG_LEVEL 1 // valid values are: DEBUG_ERROR = 0, DEBUG_NOTIFY = 1, DEBUG_VERBOSE = 2, DEBUG_DEV = 3, DEBUG_MAX = 4
+#endif
 
 /*-------------DEFINE YOUR ADVANCED NETWORK PARAMETERS BELOW----------------*/
 //#define MDNS_SD //uncomment if you  want to use mdns for discovering automatically your ip server, please note that MDNS with ESP32 can cause the BLE to not work

main/main.ino

@@ -1100,6 +1100,8 @@ void setup_wifimanager(bool reset_settings) {
     }
   }
 
+  wifiManager.setDebugOutput(WM_DEBUG_LEVEL);
+
   // The extra parameters to be configured (can be either global or just in the setup)
   // After connecting, parameter.getValue() will get you the configured value
   // id/name placeholder/prompt default length