[Quest API] Add Spell Blocked Event to Perl/Lua (#4217)

* [Spells] Add Unblockable Spell Table and Spell Blocked Event

- Add `EVENT_SPELL_BLOCKED`, exports `$blocking_spell_id`, `$cast_spell_id`, `$blocking_spell`, and `$cast_spell`.

- Add `event_spell_blocked`, exports `e.blocking_spell_id`, `e.cast_spell_id`, `e.blocking_spell`, and `e.cast_spell`.

- Adds `spells_unblockable` table with a `spell_id` and `is_unblockable` column.
- This table will need to be populated based on known spells that should be unblockable.

- This event will allow operators to perform events when spells are blocked.

* Cleanup

* Cleanup

* Update spells.cpp

* Remove unused repositories.

* Finalize

* Update lua_parser_events.cpp

zone/event_codes.h

@@ -143,6 +143,7 @@ typedef enum {
 	EVENT_ENTITY_VARIABLE_SET,
 	EVENT_ENTITY_VARIABLE_UPDATE,
 	EVENT_AA_LOSS,
+	EVENT_SPELL_BLOCKED,
 
 	// Add new events before these or Lua crashes
 	EVENT_SPELL_EFFECT_BOT,