[Handin] Item handin overhaul

[Akkadius]

Associated to server pull request here, do not merge until ready

This is a very long overdue overhaul to a complex system. That aims to solve many issues around item handins.

Why

• Instead of having separately maintained hand-in logic in Perl and Lua, they both pass-through existing plugins to the source and are handled entirely source side. Reducing bugs, defects and allowing us to far more easily add features.
• Player event records sometimes don't get caught under certain circumstances, now every hand-in no matter whether its handled in quest or not gets captured
• Item handin gets handled the same in both Perl and Lua
• Money handin gets handled the same in both Perl and Lua
• Support multi-quest natively in the source for NPC's who have it enabled
• Heavily simplify item handin logic
• Add comprehensive logging to debug deeper level handin issues

Catch-all for returning items to players

• Item loss would occur when a player hands in to an NPC with an empty EVENT_TRADE
• Item loss would occur when a player accidentally hands in to a pet instead of the intended NPC
• Item loss would occur if a script failed to add a "return_items" plugin equivalent with hand-in code
• NPCs with no proper check_handin/return_items would eat items.
• NPCs were returning a new item, not the previous item instance (items with augments). Items are simply return as their original instance, with all augments, attuned properties, serial number etc.
• Augments were eaten in Perl when doing handins because we were summoning by item ID instead of the item instance itself.