Core/Game: Include cleanup

* Mostly aimed at removing Log/DatabaseEnv includes from other headers
* Fix most packet headers including other packet headers - moved common structures such as ItemInstance to their own files
* Moved SAI function definitions to source files (massive or requiring many different dependencies)

src/server/scripts/Commands/cs_disable.cpp

@@ -22,9 +22,10 @@ Comment: All disable related commands
 Category: commandscripts
 EndScriptData */
 
-#include "DisableMgr.h"
-#include "CriteriaHandler.h"
 #include "Chat.h"
+#include "CriteriaHandler.h"
+#include "DatabaseEnv.h"
+#include "DisableMgr.h"
 #include "Language.h"
 #include "ObjectMgr.h"
 #include "OutdoorPvP.h"