Reworked connection code. Pings are now regularly sent out to every connection to check if it remains valid.

Invalid connections are moved to a second list, and eventually dropped if they don't become active.

Peernet.go

@@ -19,4 +19,5 @@ func Init() {
 func Connect() {
 	go bootstrap()
 	go autoMulticastBroadcast()
+	go autoPingAll()
 }