Make read of SleepHandler::lastOverflow atomic

Since it is a multi-byte value and is written from an ISR, it would be
possible that the ISR triggers halfway through a read, causing the read
to be garbled. This only occured when actually reading the uptime
exactly the moment the timer overflowed (every 19 hours), but it needs
to be fixed nonetheless.
Merge branch 'master' of https://github.com/Pinoccio/library-pinoccio into modules
don't need these hq definitions anymore
only run disassociate if associated