Light- or Modem Sleep

I did a pull now to merge the deepSleep and modemSleep stuff (#825).

Regarding the lightSleep it seems that this is only possible with wifi off if you want to enforce the sleep (which is what is supposed as far as I understand):

Yes, wifi_station_disconnect(); and wifi_set_opmode_current(NULL_MODE); are needed before calling force sleep function. We will add more description on this in the documentation.
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