Core: Fix annoying compile warning and some other minor changes here and there

src/server/game/Movement/Traveller.h

@@ -36,8 +36,7 @@ struct Traveller
     Traveller(const Traveller &obj) : i_traveller(obj) {}
     Traveller& operator=(const Traveller &obj)
     {
-        this->~Traveller();
-        new (this) Traveller(obj);
+        this.i_traveller = obj.i_traveller;
         return *this;
     }
 

src/server/game/Movement/Waypoints/Path.h

@@ -54,7 +54,7 @@ class Path
 
         float GetTotalLength() const { return GetTotalLength(0, size()); }
 
-        float GetPassedLength(uint32 curnode, float x, float y, float z)
+        float GetPassedLength(uint32 curnode, float x, float y, float z) const
         {
             float len = GetTotalLength(0, curnode);
 

src/server/game/Movement/Waypoints/WaypointManager.cpp

@@ -20,6 +20,7 @@
 #include "GridDefines.h"
 #include "WaypointManager.h"
 #include "MapManager.h"
+#include "Log.h"
 
 WaypointMgr::WaypointMgr()
 {