Big update.

src/ServerFacade.h

@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2016+ AzerothCore <www.azerothcore.org>, released under GNU GPL v2 license, you may redistribute it and/or modify it under version 2 of the License, or (at your option), any later version.
+ */
+
+#ifndef _PLAYERBOT_SERVERFACADE_H
+#define _PLAYERBOT_SERVERFACADE_H
+
+#include "Common.h"
+
+class Player;
+class Unit;
+class WorldObject;
+
+class ServerFacade
+{
+    public:
+        ServerFacade() { };
+        virtual ~ServerFacade() { };
+        static ServerFacade* instance()
+        {
+            static ServerFacade instance;
+            return &instance;
+        }
+
+	public:
+        float GetDistance2d(Unit* unit, WorldObject* wo);
+        float GetDistance2d(Unit* unit, float x, float y);
+        bool IsDistanceLessThan(float dist1, float dist2);
+        bool IsDistanceGreaterThan(float dist1, float dist2);
+        bool IsDistanceGreaterOrEqualThan(float dist1, float dist2);
+        bool IsDistanceLessOrEqualThan(float dist1, float dist2);
+
+        void SetFacingTo(Player* bot, WorldObject* wo, bool force = false);
+
+        Unit* GetChaseTarget(Unit* target);
+};
+
+#define sServerFacade ServerFacade::instance()
+
+#endif