[7463] Make basic preparations for replace 0 as ok spell cast value by more correct value.

Currently 0 used ast OK value for spell cast checks BUT 0 = SPELL_FAILED_AFFECTING_COMBAT
So another values need used. This required lot code changes. This is first step.

src/game/Spell.h

@@ -20,6 +20,7 @@
 #define __SPELL_H
 
 #include "GridDefines.h"
+#include "SharedDefines.h"
 
 class WorldSession;
 class Unit;