Add a separate hi-priority queue, with Real Priorities (TM).

De-brain TypeMap: static Types only, list a list of String classnames.
Must edit the list for each new Freezable class.
Remove DTaskImpl back to DTask.
Priorities moved to a priority v-call.
FJPacket priorities come from a table.
Fix bug in TimelineSnapshot where nidx is < 0 instead of == -1