Reducing lag from switching songs using exactly the same set of loaded samples

[KungFuFurby]

Related to #240, but it is inspired by a methodology that LadiesMan217/Rem was trying to do manually. Specifically...

• Check which songs use exactly the same set of samples.
• Set the sample directory based off of the largest song.
• Load samples if they're not already loaded.
• For all subsequent songs that use the same sample pack, just load them.

This requires a data version bump because it changes the behavior of how the sample listings are handled, especially on the SNES side, since the auto-detection mechanism of the sample directory is going to be on its way out in this specific case. It requires the implementation of #424 for a start... but then I have to implement full-blown sample pack IDs, because now I'll be tracking all of the local songs by sample pack ID. This may also have an optional add-on pack or packs, complete with memory locations to upload to, because of sample groups containing non-important samples, and/or there are minor add-ons that still meet the memory requirements, at least in theory.