Multiple fixes

-Constants removed
-Public Broadcast when no IP specified
-Fixed net_exec implementation
-Added net_exec command for delayed disconnection
-Fixed order of subexecutions in net_recieve
-Don't update peer information when source is self
-Only allow destination key '-1' on local broadcast
-Revised and renamed native messages
-Switched IP devicemaster connection to local broadcast connection
-Added posibility to connect without IP