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).
Made NPCs now work properly on multiworld system. Solved multiple issues
regarding Player Shops not giving back items properly when owner exits.
Added restriction on changing channels at FM rooms, preventing shop
owner entering Cash Shop.
Fixed a issue on server delaying whenever a player gets a new card for
the mobbook. Some code refactoring unifying the several item picking-up
methods on the project.
Now Horntail can be spawned properly by a command. Fixed a rase case
where an extremely high value of EXP gain would cause integer overflow,
potentially crashing one's client.
Completed (hopefully, now!) implementation of automated modules for PQ
scripting. Added HP bar for some bosses that wouldn't display it before
(like King Slime, Alishar and CRog).
