Core/Movement: Add new SplineChainMovementGenerator that allows accurate replication of sniffed waypoints in static sequences, along with DB facilities that allow loading of waypoints from DB.

src/server/game/AI/SmartScripts/SmartScriptMgr.cpp

@@ -573,7 +573,7 @@ bool SmartAIMgr::IsEventValid(SmartScriptHolder& e)
             }
             case SMART_EVENT_MOVEMENTINFORM:
             {
-                if (e.event.movementInform.type > NULL_MOTION_TYPE)
+                if (e.event.movementInform.type >= MAX_MOTION_TYPE)
                 {
                     TC_LOG_ERROR("sql.sql", "SmartAIMgr: Entry %d SourceType %u Event %u Action %u uses invalid Motion type %u, skipped.", e.entryOrGuid, e.GetScriptType(), e.event_id, e.GetActionType(), e.event.movementInform.type);
                     return false;