Moved ScriptMgr macros to separated header and created ModuleScript

it will allow Modules to create their own Hooks inside the
module itself, to customize/extend their functionalities.

An example of its usage will be available in VAS Module:
You'll be able to disable VAS with custom conditions from other modules.

src/server/game/Scripting/ScriptMgrMacros.h

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2016+     AzerothCore <www.azerothcore.org>, released under GNU GPL v2 license: http://github.com/azerothcore/azerothcore-wotlk/LICENSE-GPL2
+ * Copyright (C) 2008-2016 TrinityCore <http://www.trinitycore.org/>
+ * Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
+ */
+
+// Utility macros to refer to the script registry.
+#define SCR_REG_MAP(T) ScriptRegistry<T>::ScriptMap
+#define SCR_REG_ITR(T) ScriptRegistry<T>::ScriptMapIterator
+#define SCR_REG_LST(T) ScriptRegistry<T>::ScriptPointerList
+
+// Utility macros for looping over scripts.
+#define FOR_SCRIPTS(T, C, E) \
+    if (!SCR_REG_LST(T).empty()) \
+        for (SCR_REG_ITR(T) C = SCR_REG_LST(T).begin(); \
+            C != SCR_REG_LST(T).end(); ++C)
+#define FOR_SCRIPTS_RET(T, C, E, R) \
+    if (SCR_REG_LST(T).empty()) \
+        return R; \
+    for (SCR_REG_ITR(T) C = SCR_REG_LST(T).begin(); \
+        C != SCR_REG_LST(T).end(); ++C)
+#define FOREACH_SCRIPT(T) \
+    FOR_SCRIPTS(T, itr, end) \
+    itr->second
+
+// Utility macros for finding specific scripts.
+#define GET_SCRIPT(T, I, V) \
+    T* V = ScriptRegistry<T>::GetScriptById(I); \
+    if (!V) \
+        return;
+#define GET_SCRIPT_RET(T, I, V, R) \
+    T* V = ScriptRegistry<T>::GetScriptById(I); \
+    if (!V) \
+        return R;
+