Redundant files in classic BGM pack for question arcs

The question arcs' classic BGM pack contains a huge amount of files that are completely identical with the files from MangaGamer's current soundtrack, particularly most of the lsys files and MIDI conversions.

Unless you want your patches to be compatible with outdated vanilla versions, these are completely pointless, seeing how they just replace identical files.

Examine the classic BGM pack for question arcs to identify redundant files that duplicate the MangaGamer soundtrack. Look at the file structure and compare lsys and MIDI files. Determine which files can be safely removed without breaking compatibility for outdated versions. Check the patch compiler's handling of BGM assets to understand the impact.

Written by the indexing model from the issue text.