Core/Phases: add table for corpse_phases

- set all phase related fields to unsigned
- remove old phaseMask from corpse table

sql/updates/characters/2014_10_28_00_characters.sql

@@ -0,0 +1,8 @@
+ALTER TABLE `corpse` DROP `phaseMask`;
+
+DROP TABLE IF EXISTS `corpse_phases`;
+CREATE TABLE `corpse_phases` (
+  `Guid` int(10) unsigned NOT NULL,
+  `PhaseId` int(10) unsigned NOT NULL,
+  PRIMARY KEY (`Guid`,`PhaseId`)
+);