[7252] Move all world global broadcast string (all arena/bg related) to mangos_string.

PLEASE, NOT USE string world broadcasts in real code. This function _only_ for debug purposes.

    Really allow with .debug bg start bg with 1 player.
    Added helps for some existed .debug commands.

Author: VladimirMangos

--HG--
branch : trunk

src/game/World.cpp

@@ -2645,7 +2645,7 @@ void World::SendGMText(int32 string_id, ...)
             delete data_cache[i][j];
 }
 
-/// Send a System Message to all players (except self if mentioned)
+/// DEPRICATED, only for debug purpose. Send a System Message to all players (except self if mentioned)
 void World::SendGlobalText(const char* text, WorldSession *self)
 {
     WorldPacket data;