Add support for all Roland MDX models

Merged Julian Gallimore requested to merge github/fork/s-ol/all-mdx into master

Created by: s-ol

Hello! Somewhere between fabmodules and mods, support for other mills from the roland MDX series got lost. The differences between them are minimal, so I modified the Roland MDX-20 module to support all of them with a model <select> tag. The values are all taken from the original fabmodules source.

Due to the current health situation I cannot access my lab and verify that everything works, so I would suggest this PR stay open until that is properly verified.

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