AL to call-out packets it's sending to assist with debugging for now.
Decouple netty packet delivery from processing as it doesn't seem to like re-entrant behaviours.
Initial PacketSorter implementation - ready for simplified recovery and future multi-threading support.
Reduce Leader's intimate knowledge of AL functions
Fix a bug in install and make simpler.
Revised PacketSorter to handle dispatch of lingering packets post recovery.
Replace RecoveryTrigger with PacketSorter