Core/Players: Added support for single character bans

Core/Commands: Renamed .ban character to .ban playeraccount (.ban character will ban only the player, not account)

This revision reaches 10000, congratulations and thanks to everyone who contributed!

--HG--
branch : trunk

sql/updates/10000_world_command.sql

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+DELETE FROM `command` WHERE `name` IN ('ban character','ban playeraccount');
+INSERT INTO `command` (`name`,`security`,`help`) VALUES
+('ban character',3,'Syntax: .ban character $Name $bantime $reason\nBan character and kick player.\n$bantime: negative value leads to permban, otherwise use a timestring like "4d20h3s".'),
+('ban playeraccount',3,'Syntax: .ban playeraccount $Name $bantime $reason\nBan account and kick player.\n$bantime: negative value leads to permban, otherwise use a timestring like "4d20h3s".');