v4.0, v5.0, and latest currently do not properly build for schemas (incl enums)

[lzehl]

v3.0 seems to be the only complete version.

[Raphael-Gazzotti]

To be confirmed, but the current structure appears to match what @apdavison intended after commit 58dd355.

The files previously present in schemas/v3.0 at 9952335 were deprecated and had not been properly cleaned up.

[Raphael-Gazzotti]

However some of the enums are still missing after classes renaming.