Speed up mood loading.

Speed up mood loading.

The old code passed a pointer to the row of the audio file table to the
mood scoring functions. The scoring functions had to obtain the afsi,
afhi, path from that row pointer. Thus, at mood load time, the afsi,
afhi, path was extracted N times for each audio file if there are N
mood lines that used this info.

This patch changes the mood scoring functions so that they take
three pointers to afsi, afhi, path instead of the row pointer.
add_item_score(), the single caller of the mood scoring functions,
provides these pointers, i.e. they get extracted from the row pointer
only once per audio file.

This is still not optimal as most scoring functions use only one of
the three pointers. But let's not over-engineer the thing.