Field names and lack of `pub` from typify-generated code

[dpezely]

There's a PR for typify with a fix plus an issue highlighting a work-around when converting W3C's mnx-schema.json file.

Both might be of interest to you and those who use your crate:

• Private tuple fields should be pub oxidecomputer/typify#913
• Obtain name from SchemaObject; otherwise, keep existing default subtype_{idx} oxidecomputer/typify#912

Even if that PR is inadequate for them to merge, it works specifically for the MNX schema.

Likewise, if the issue linked above doesn't get resolved soon, it's an easy 1-liner:

sed -i -E 's%^(pub struct) (OttavaAmount(|OrZero)|TimeSignatureUnit).i64.%\1 \2(pub i64)%' mnx.rs

(That's suitable for Linux. If on BSD or macos, remember that -i takes an argument such as _ORIG for renaming original file.)