refactor(Core/Creature): Remove Inhabit Type (#9272)

This is in reference to issue: https://github.com/azerothcore/azerothcore-wotlk/issues/4361
This is comprised of a cherry pick and partial tc cherry pick:
592516ae69
dbadb6369c
34cfa69efd
12de860b4a
a22bc236eb

src/server/game/Combat/HostileRefMgr.h

@@ -59,6 +59,8 @@ public:
 
     HostileReference* getFirst() { return ((HostileReference*) RefMgr<Unit, ThreatMgr>::getFirst()); }
 
+    void updateThreatTables();
+
     void setOnlineOfflineState(bool isOnline);
 
     // set state for one reference, defined by Unit