If wifi does reconnect, change the displayed message to "Wifi reconnected after X attempts", and delete any unread wifi disconnect / can't connect messages.
DONE by Jan: ~Turn the wifi icon red if wifi is enabled, but wifi is not connected.~
Allow end user to modify wifi reconnect "schedule" (currently an array and two DEFINEs in wifi.h).
DONE: ~Add "Disable Wifi" button to the display of "Wifi can't connect" and "Wifi disconnected" messages.~
Treat these two things differently: wifi can't connect the first time it tries, and wifi disconnects after being connected.