Merge #7692: Remove p2p alert system
cfd519e Add release note documentation (BtcDrak)
6601ce5 protocol.h/cpp: Removes NetMsgType::ALERT (Thomas Kerin)
ad72104 Formatting (BtcDrak)
1b77471 Remove alert keys (BtcDrak)
01fdfef Remove -alerts option (BtcDrak)
9206634 Update alert notification and GUI (BtcDrak)
bbb9d1d Remove p2p alert handling (BtcDrak)