Core/Spells: partially implement Dancing Rune Weapon and handle Blood DK t12 4p bonus

sql/updates/world/4.3.4/2022_01_05_01_world.sql

@@ -0,0 +1,9 @@
+DELETE FROM `spell_script_names` WHERE `ScriptName`= 'spell_dk_dancing_rune_weapon';
+INSERT INTO `spell_script_names` (`spell_id`, `ScriptName`) VALUES
+(49028, 'spell_dk_dancing_rune_weapon');
+
+UPDATE `creature_template` SET `ScriptName`= 'npc_pet_dk_rune_weapon', `flags_extra`= 0 WHERE `entry`= 27893;
+
+DELETE FROM `spell_proc` WHERE `SpellId`= 49028;
+INSERT INTO `spell_proc` (`SpellId`, `SpellFamilyName`, `SpellTypeMask`, `SpellPhaseMask`) VALUES
+(49028, 15, 1, 2);