Hired Merchant & Player shop fixes + Owl of Minerva

Thanks to BenjixD DietStory's dev team, many bugs found by them have
been patched (pirate quests, missing drop data, fly command, etc).
Implemented Owl of Minerva. Fixed many issues with Hired Merchant and
Player Shops. Fixed an error with the slot checking system. Added Wish
Tickets (circa-2006 GMS event) to be dropped on AmoriaPQ.

docs/feature_list.txt

@@ -60,6 +60,7 @@ Server potentials:
 * Mastery book announcer displays droppers of needed books of a player, by reading underlying DB.
 * Every skill/mastery book is now droppable by mobs.
 * Inventory auto-gather and auto-sorting feature.
+* Enhanced auto-pot system: pet uses as many potions as necessary to reach the desired threshold.
 * Enhanced buff system: smartly checks for the best available buff effects to be active on the player.
 * Enhanced AP auto-assigner: exactly matches AP with the needed for the player's current level, surplus assigned to the primary attribute.
 * Added Boss HP Bar for dozens of bosses (needs provided custom wz).
@@ -67,8 +68,9 @@ Server potentials:
 * Custom jail system (needs provided custom wz).
 * Delete Character 100% (requires ENABLE_PIC activated).
 * Boats, elevator and other travelling mechanics fully working.
-* Eanbled Hired Merchant can be used anywhere but FM Entrance.
+* Enabled Hired Merchant being able to be used anywhere but FM Entrance and other few places.
 * Vega's spell.
+* Owl of Minerva.
 * Pet item ignore.
 * Autosaver (periodically saves on DB current state of every player in-game).