LEAmDNS Fixes 1.1 (#5619)

* Fixes 1.1

- Better separation of ESP wifi thread code from user thread code
- Added a flag for 'update()'-less use (disabled by default)
- The too fast updates for service queries are fixed
- Switched fully to PolledTimeout; LEATimeFlag not needed anymore (BTW: a const 'expired()' method would be helpful)
- The device should stay visible now even after the first TTL timeout
- Improved service querying (queries five times now)

* Update mDNS_Clock.ino

Removed references to LEATimeFlag.h

* Update mDNS_Clock.ino

Styling

libraries/ESP8266mDNS/src/LEAmDNS_Helpers.cpp

@@ -170,6 +170,7 @@ namespace MDNSImplementation {
  */
 
 bool MDNSResponder::_callProcess(void) {
+    DEBUG_EX_INFO(DEBUG_OUTPUT.printf("[MDNSResponder] _callProcess (%lu, triggered by: %s)\n", millis(), m_pUDPContext->getRemoteAddress().toString().c_str()););
 
     return _process(false);
 }