Fixed successful scrolled items not using up an upgrade slot when using white scroll. Fixed some issues with the PiratePQ and added a "clear all boxes to complete a stage"-mode. Added "Party for Starters" feature. Added concurrency protection on event script modules.
Implemented Guild PQ. Fixed a problem introduced earlier where negative
EXP would be deemed as "integer overflow", provoking many game breaking
issues as result.
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).
