Use correct file reader for palettes and migrate old workspaces #31719
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This PR adds file version numbers to user's palette files. Previously, these were unversioned and the latest file reader would be used no matter which version the file had last been saved in. This has caused lots of bugs and complicated migration between versions.
We probably won't need to add anything new to
PaletteCompat::migrateOldPaletteCellIfNeeded. The migration in here should be covered by migration code we are adding in the mscx reader anyway.