Merge branch 'airplane-mode' of https://github.com/evergreen22/InfiniTime into evergreen22-airplane-mode

# Conflicts:
#	src/CMakeLists.txt
#	src/displayapp/Apps.h
#	src/displayapp/DisplayApp.cpp
#	src/displayapp/Messages.h
#	src/displayapp/screens/settings/Settings.cpp

src/systemtask/Messages.h

@@ -31,6 +31,7 @@ namespace Pinetime {
         BatteryPercentageUpdated,
         StartFileTransfer,
         StopFileTransfer,
+        AirplaneModeToggle
       };
     }
 }