message: add check to dissallow starting cp if already running
  This will avoid support inquiries and add a log
diff: @@ -657,6 +657,13 @@ boolean WiFiManager::startConfigPortal() {
  boolean WiFiManager::startConfigPortal(char const *apName, char const *apPassword) {
  _begin();
  + if(configPortalActive){
  + #ifdef WM_DEBUG_LEVEL
  + DEBUG_WM(DEBUG_VERBOSE,F("Starting Config Portal FAILED, is already running"));
  + #endif
  + return false;
  + }
  +
  //setup AP
  _apName = apName; // @todo check valid apname ?
  _apPassword = apPassword;
  