Scripts/Naxxramas: Adjustments to the Loatheb encounter

- Adjusted doom cast timings as per boss mod timers.
- Add Deathbloom's final tick using spellscript
- Move Spores' Fungal Creep cast handling to Loatheb's cpp instead of handling it in SmartAI
- Fungal Creep should also be cast if the spore expires (important for Spore Loser achievement)
- Remove Fungal Creep from players on reset to avoid cheesy strats

(cherry picked from commit ea1c783b84)

sql/updates/world/2015_10_30_01_world_2015_10_10_02.sql

@@ -0,0 +1,8 @@
+--
+DELETE FROM `smart_scripts` WHERE `entryorguid`=16286 AND `source_type`=0;
+UPDATE `creature_template` SET `AIName`="" WHERE `entry`=16286;
+
+DELETE FROM `spell_script_names` WHERE `spell_id` IN (29865,55053);
+INSERT INTO `spell_script_names` (`spell_id`,`ScriptName`) VALUES
+(29865,"spell_loatheb_deathbloom"),
+(55053,"spell_loatheb_deathbloom");