[6910] Implemented rewritten arenas. Original author w12x@getmangos.com

Many thanks also to:
  Balrok@github.com for long time updating.
  Triply@github.com for great work in rewriting process.
  All who I forget to name.
Signed-off-by: ApoC <apoc@nymfe.net>

src/game/debugcmds.cpp

@@ -30,6 +30,7 @@
 #include "GossipDef.h"
 #include "Language.h"
 #include "MapManager.h"
+#include "BattleGroundMgr.h"
 #include <fstream>
 #include "ObjectMgr.h"
 
@@ -518,3 +519,9 @@ bool ChatHandler::HandleGetItemState(const char* args)
 
     return true;
 }
+
+bool ChatHandler::HandleDebugArenaCommand(const char * /*args*/)
+{
+    sBattleGroundMgr.ToggleArenaTesting();
+    return true;
+}