[Tasks] Schema simplification (#2449)

* Combine task_activity item and npc fields

This will make tooling easier.

While denormalizing goallists may not be ideal, it decouples tasks from
rewards which share the table and removes a redundant column in favor
of a using the delimited string which better matches live packet data.

* [Tasks] Deprecate goallists table, migrate reward goal lists, simplify logic

* Update 2022_09_25_task_concat_matchlists.sql

* Update 2022_09_25_task_concat_matchlists.sql

* Tweaks

* Fix reward column name in conversion script

* Task reward stacking

* Update task_client_state.cpp

* Implement stack counts

* Fix reward item instance memory leak

* Validate reward item instance

* Fix item reward message

* Fix findtask

Co-authored-by: Akkadius <akkadius1@gmail.com>

zone/CMakeLists.txt

@@ -140,7 +140,6 @@ SET(zone_sources
     spell_effects.cpp
     spells.cpp
     task_client_state.cpp
-    task_goal_list_manager.cpp
     task_manager.cpp
     tasks.cpp
     titles.cpp
@@ -265,7 +264,6 @@ SET(zone_headers
     spawngroup.h
     string_ids.h
     task_client_state.h
-    task_goal_list_manager.h
     task_manager.h
     tasks.h
     titles.h