Scripts/UtgardePinnacle: King Ymiron

- Updated to EventMaps
- Replaced manual summons with proper spells
- Fixed glitch where boss would resume fight/run back to his main target before the ancestor summon roleplay was over (it might still need few adjustments i.e fire on boat is currently missing)
- Implemented damage calculation for spell Dark Slash (http://www.wowhead.com/spell=48292) as previously the spell would do no damage and it's BasePoints is 0

sql/updates/world/2014_09_13_01_world_spell_script_names.sql

@@ -0,0 +1,3 @@
+DELETE FROM `spell_script_names` WHERE `spell_id` = 48292;
+INSERT INTO `spell_script_names` (`spell_id`, `ScriptName`) VALUES
+(48292, 'spell_ymiron_dark_slash');