This includes:
* CBID_VEHICLE_32DAY_CALLBACK
* CBID_VEHICLE_REFIT_COST
* CBID_VEHICLE_MODIFY_PROPERTY
This is on a per-property basis
The main benefit of this is to avoid callbacks not handled by the
vehicle's current sprite group from using the full graphics chain as
the "default" branch in the callback switch.
In the case where the graphics chain is long/expensive, a lot of work
had to be done before a callback failure result was eventually returned.
Due to 47a99bb the order of elements in the garbage collection chain has
changed causing the class to be finalised before the instances of that class.
Since the instance's array of member values depends on the size of the values
in the class, the class finalisation resetting that size to 0 causes not all
finalisations to run, which subsequently causes a heap use after free. So,
just set the SQObjectPtrs to 'null' during the finalisation of the SQClass
so the SQInstance can release all instance variables during its finalisation.
(cherry picked from commit 5c01f9ea52)
See: #256
Due to 47a99bb the order of elements in the garbage collection chain has
changed causing the class to be finalised before the instances of that class.
Since the instance's array of member values depends on the size of the values
in the class, the class finalisation resetting that size to 0 causes not all
finalisations to run, which subsequently causes a heap use after free. So,
just set the SQObjectPtrs to 'null' during the finalisation of the SQClass
so the SQInstance can release all instance variables during its finalisation.
Practically the length of the handlers not being equal to the number of
features is the problem as it means something was forgotten when adding
a new feature, so static assert to that and let the existing check on
the feature number take care of invalid data from the NewGRFs.
Functions like localtime, gmtime and asctime are not thread safe as they (might) reuse the same buffer. So use the safer _s/_r variant for localtime and gmtime, and use strftime in favour of asctime.
