[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

sql/updates/7252_01_mangos_command.sql

@@ -0,0 +1,6 @@
+ALTER TABLE db_version CHANGE COLUMN required_7251_01_mangos_spell_chain required_7252_01_mangos_command bit;
+
+DELETE FROM `command` WHERE `name` IN ('debug arena','debug bg');
+INSERT INTO `command` VALUES
+('debug arena',3,'Syntax: .debug arena\r\n\r\nToggle debug mode for arenas. In debug mode GM can start arena with single player.'),
+('debug bg',3,'Syntax: .debug bg\r\n\r\nToggle debug mode for battlegrounds. In debug mode GM can start battleground with single player.');