AGOS: Add missing loyalty rating to Feeble Files 4CD version

This attempts to restore the missing loyalty rating setting to the
4CD version of The Feeble Files. So far only for the English
version, since that's all I have, but it would not surprised me if
the other versions are similar.
AGOS: Add setLoyaltyRating() function
AGOS: Move most off the loyalty rating workaround to off_b2Set()

Kirben pointed out that there were more loyalty rating events tied
to this opcode than to off_loadVideo(). I didn't notice this
myself since the video loading was so much easier to spot in the
script dump. It's a pity there doesn't seem to be any one opcode
that covers all of the cases.
AGOS: Modify setLoyaltyRating() on Kirben's suggestion
AGOS: Fix cut-and-paste error in setLoyaltyRating()
Merge pull request #441 from eriktorbjorn/feeble-loyalty

Possible fix for bug #6525, AGOS: FF - Loyalty Rating never changes in 4 CD version