Release mega-20190227

Changes in mega-20190227 (since mega-20190226):

ESPEasy release bot (1):
      automatically updated release notes for mega-20190227

Gijs Noorlander (1):
      Fix build error

TD-er (6):
      [Factory Reset] Make default switch/relay rules more intuitive
      [Factory Reset] Change #switch in rules and plugin to #state
      [Heap stats] Show heap statistics on core 2.5.0 and newer
      [WiFi] Only perform network activity when connected
      [Build] Add normal core 2.6.0 SDK2 build
      [WiFiClient] Make sure all clients use at least some timeout