Scripts/Spells: Hallow's End item Hallowed Wand

Hallowed Wand items should cast a transformation on party members.

by @DevRival, closes  #3574

Before this patch, the following spells do not have any effect at all:
- 24717, Pirate Costume
- 24718, Ninja Costume
- 24719, Leper Gnome Costume
- 24720, Random Costume
- 24737, Ghost Costume

Details from testing on the current 3.3.5 branch (commit ecbbcc8):
- 24724 (Skeleton Costume) seems to work as intended
- 24733 (Bat Costume) only lasts 10 seconds instead of 60 minutes
- 24741 (Wisp Costume) also seems to work as intended

All the spells listed above are included in this PR.

(cherry picked from commit 3fdbcf18ae)

sql/updates/world/2016_01_15_03_world_2015_12_01_00.sql

@@ -0,0 +1,12 @@
+--
+-- Hallowed wand spell script names
+DELETE FROM `spell_script_names` WHERE `ScriptName`= 'spell_hallow_end_wand';
+INSERT INTO `spell_script_names` (`spell_id`,`ScriptName`) VALUES
+(24717, 'spell_hallow_end_wand'), -- Pirate Costume
+(24718, 'spell_hallow_end_wand'), -- Ninja Costume
+(24719, 'spell_hallow_end_wand'), -- Leper Gnome Costume
+(24720, 'spell_hallow_end_wand'), -- Random Costume
+(24724, 'spell_hallow_end_wand'), -- Skeleton Costume
+(24733, 'spell_hallow_end_wand'), -- Bat Costume
+(24737, 'spell_hallow_end_wand'), -- Ghost Costume
+(24741, 'spell_hallow_end_wand');  -- Wisp Costume;