Core/Spells: unclusterfuck weapon damage spell effect handler

* weapon effect values can now be manipulated via spell scripts
* moved Kill Shot attack power bonus to spell_bonus_data
* converted Warrior's Devastate effect handler hack to spell script

sql/updates/world/custom/custom_2019_11_08_00_world.sql

@@ -0,0 +1,7 @@
+DELETE FROM `spell_script_names` WHERE `ScriptName`= 'spell_warr_devastate';
+INSERT INTO `spell_script_names` (`spell_id`, `ScriptName`) VALUES
+(20243, 'spell_warr_devastate');
+
+DELETE FROM `spell_bonus_data` WHERE `entry`= 53351;
+INSERT INTO `spell_bonus_data` (`entry`, `ap_bonus`, `comments`) VALUES
+(53351, 0.45, 'Hunter - Kill Shot');