This reverts commit a37b0e8181f055d4778c53aa873816af4349aa9d.
Turns out the overlapping byte access was for the questItems
array, but using Ids which start at 82 rather than 0
Byte 6 of the flags data, for flags 48 to 55, is directly used
in several places. I didn't think it was needed, but turns out
it is. So I've had to refactor the bool array I had previously
to have this as a bitset, so byte 6 can be accessed