fix(Core/Spells): Master of Elements (#7102)

* Core/Spells: Master of Elements:

Proc now also from arcane spells.
Properly proc from periodic spells.
Fixed #6035.

* You shouldn't be there.

* Buildfix.

* missing sql.

data/sql/updates/pending_db_world/rev_1627305467043107200.sql

@@ -0,0 +1,3 @@
+INSERT INTO `version_db_world` (`sql_rev`) VALUES ('1627305467043107200');
+
+UPDATE `spell_proc_event` SET `SchoolMask`=84 WHERE `entry`=-29074;