Use named types for onion callbacks.

This is now a style rule: you can only use typedef'd function types.

Previous rules now applied in `onion_*.c`:
* `struct`s must have a name (typedef of unnamed struct is not allowed).
* `++i` for increment-stmt, not `i++`, e.g. in loops.
* Only a single declarator per struct member declaration.
* Type_Names vs. variable_names.

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