This adds edge cases to the existing logic that checks the
vertex UV values to fix stretched BG videos on 11 to 17
already.
However, 9 and 10 also show this issue on modern GPU
hardware though it does not appear on all BG videos but
only on videos from 1st to 3rd style songs.
This commit addresses that issue by adding the missing
checks to the existing logic. Additional refactoring of
configuration naming etc. to match the extended
functionality is included.
I know this is slightly redundant but we should stick to this
pattern as we have multiple old games that do not use identical
conf and gamestart files.
