Release mega-20190809

Changes in mega-20190809 (since mega-20190805):

Artem (1):
      String representation for requested weekday

Bartłomiej Zimoń (1):
      [P076] setMode is not needed in interrupt mode

ESPEasy release bot (1):
      automatically updated release notes for mega-20190809

Gijs Noorlander (13):
      Config page not able to clear all WiFi settings
      Check for WiFi connected before trying to connect to host
      [ESPeasy Serial] Update to 1.0.12 to allow invalid pin config
      [Serial] Show serial port description as port in device page
      [ESPeasy p2p] Show remote node as port description on device page
      [Webserver] Do not allow writing to internal buffer for chunked transfer
      [WiFi] Cleanup some WiFi code
      [WiFi] Fix issue where node could disable plugins when offline for long
      [Reboot] Flush all buffers and controllers before reboot
      [ArduinoOTA] Suggest UDP port to use 18266 since 8266 is for ESPeasy p2p
      [Shutdown] Move delay(100) to after SPIFFS.end()
      [Plugin info] Show extra info in devices web page
      [Docs] Document sharing plugin via ESPeasy p2p controller