Have a public API so that svd2pac can be used as a lib

[corco]

Is your feature request related to a problem? Please describe.

It is inconvenient to require a SVD file when it is not readily available. When registers are available in another format, for example YAML or a custom internal representation, having to generate and save the SVD prior to using svd2pac is bothersome.

Also, calling svd2pac::main from a tool application with string arguments is not idiomatic.

Describe the solution you'd like

If svd2pac was available as a library, with a public IR and generate functions, it would be possible to use it without explicitly requiring a SVD / call to main.

Describe alternatives you've considered

Using svd-encoder crate to generate SVD, saving the file than calling svd2pac::main.

Additional context

In our (very) specific case, we have an internal register representation that we use to generate FPGA logic as well as software access layer. Converting to svd2pac's IR is more natural than generating a throwaway SVD to serve as middleman.

[pellico]

@corco Thank you for request.
This is nice enhancement but in order to have a decent interface I see the following steps:

• IR interface definition, just direct access to struct or setter/getter
• IR documentation
• Polish GenPackSettings. It is quite ugly
• Polish generate_rust_package