Obsidian Sanctum: Many improvements & fixes, by moriquendu

Closes issue #1278
Closes issue #2505
Finally I make some time to review & push this change. Thanks for the patience

--HG--
branch : trunk

sql/updates/8806_spell_script_target.sql

@@ -0,0 +1,5 @@
+-- Limit Flame Tsunami buff to Lava Blazes only
+DELETE FROM spell_script_target WHERE entry = 60430;
+INSERT INTO spell_script_target (entry, type, targetEntry) VALUES
+  (60430, 1, 30643),
+  (60430, 1, 31317);