Using Java ThreadPool + Mob Skills & Event Instance patch + Eqp Merge

Server source now uses Java ThreadPool, recycling used thread resources for next uses.
Added Grenade visual effect for other players.
Implemented an attempt towards unsynced mob behavior, where reportedly players were able to pin same mob in different sections of the map.
Solved several deadlock issues, mostly regarding character synchronized methods, event instance scripts and player/item vision-unvision.
Solved an issue where mobs would not cast some skills of it's skillset. Frequent behavior on low-leveled mobs.
Fixed a bug on 2nd Maker quest where players could complete it by merely disassembling an equipment.
New custom mechanic: equipment merge. Similarly to the Bazaar NPC, every equipment after the selected one is used up, and a fraction of their stat amounts are used as stat gains on the currently equipped items. If restrictions are enabled, players must be high-leveled and Maker lv3 to use it.
Skill Storm Break no longer uses up arrows.
Added a server flag to allow access for all Aran job skills from the beginning.
Implemented Battleship and Super Transformation questline scripts.
Fixed a desynchronization within pet position and cash inventory position, that could potentially lead to some inventory issues until relogin.
Improved timestamp handling in some handler classes. Spam detection is entirely a server-side matter, hence removed usage of client-sided timestamp content.
Refactored some pet response packets, improving some of their behaviors.
Fixed some quest issues: Maker lv1 and Omega Sector meteorite one.

docs/feature_list.md

@@ -89,6 +89,7 @@ Cash & Items:
 * Storage with "Arrange Items" feature functional.
 * Close-quarters evaluation mode for items (sandbox).
 * Further improved Karma scissors & Untradeable items mechanics.
+* Reviewed pet/item position data inconsistency within CASH inventory.
 * Spikes on shoes.
 * Vega's spell.
 * Owl of Minerva.
@@ -175,6 +176,7 @@ Server potentials:
 * Delete Character (requires ENABLE_PIC activated).
 * Smoothed up view-all-char feature, now showing properly all available characters and not disconnecting players too often.
 * Centralized getcurrenttime throughout several server handlers, boosting it's performance overall.
+* Centralized server timestamping, several timestamps received from clients are now unused, preventing some spammable exploits.
 * Autosaver (periodically saves on DB current state of every player in-game).
 * Both fixed and randomized versions of HP/MP growth rate available, regarding player job (enable one at ServerConstants). Placeholder for HP/MP washing feature.
 * Implemented methods to get the current Players' MaxHP/MaxMP method with equipment HP/MP gains already summed up.
@@ -191,6 +193,7 @@ Custom NPCs:
 * Asia: scroll & rarities shop NPC.
 * Abdula: lists droppers of needed skill/mastery books.
 * Agent E: accessory crafter.
+* Dalair: automatized equipment-merger.
 * Donation Box: automatized item-buyer.
 * Coco & Ace of Hearts: C. scroll crafters.
 
@@ -239,6 +242,7 @@ Project:
 * Reviewed SQL data, eliminating duplicated entries on the tables.
 * Improved login phase, using cache over DB queries.
 * Usage of HikariCP to improve the DB connection management.
+* Usage of Java Threadpool to improve runnable call management.
 * Developed many survey tools for content profiling.
 * Developed a robust anti-exploit login coordinator system.
 * Protected many flaws with login management system.