Overhauled the HikariCP connection, now it properly tries the best to hand out a DB connection. Fixed "commands" NPC crashing out players when entering the command multiple times in a short time. Rebalanced HP/MP gain on leveling up/AP resetting. Rebalanced HP/MP loss when AP resetting to use the same amount they would be earning on levelup. Fixed EXP distribution now computing overall monster maxHP plus heal instead of flat monter maxHP, that rendered on distributions of over 100% of the raw EXP. Added concurrency protection on MapleMonster. Fixed an issue on venom skills that would let an "1 dmg" appear to the client alongside the DOT.
Added experimental autosaver feature. Fixed pet ignore feature not
saving/loading data in some cases. Added concurrency protection for
inventory classes and monster book.
Added mechanics for the EXP/DROP cash coupons (such as enabling
out-of-time active coupons via command and automatic update of active
ones over the designed interval). Created MapleCouponInstaller as means
to gather info about the coupon intervals and rates from the WZs (the
generated SQL table is already updated on the db_database.sql file).
