Implement banks for performances

[probonopd]

With #500, "only" 127 performances can be handled (note that the TX802 could handle even fewer!).

In order to be able to have more than 127 performances, we need banks, like we have for voices.

Reference:

• https://github.com/probonopd/MiniDexed/pull/500#issuecomment-1676246274