There was an issue reported where save files between different
versions of a manufacturer's compiler were incompatible because the time_t
ubirthday field was changed from 32 bits to 64 bits.
32 bit time_t implementations will break at 19:14:07 on January 18, 2038.
64 bit time_t implementations will break at 23:59:59 on December 31, 3000.
This removes the dependency on the size of time_t from the save file.
The ubirthday field is no longer embedded in struct you.
This also adds two general purpose routines to hacklib.c, one to convert a time
value to a 14 character char representation and the other to convert that
back to time_t. Those are used by the save/restore routines.
This is a savefile breaking change, so editlevel in patchlevel.h was
incremented.
d430db0718