This is a replicated "manager" for network prediction. Its purpose is only to replicate system-wide data that is not bound to an actor. Currently this is only to house a "mini packagemap" which allows stable shared indices that map to a small set of uobjects to be.UPackageMapcan assign per-client net indices which invalidates sharing as well as forces 32 bit guis. this is a more specialzed case where we want to replicate IDs as btyes.