Add ODB++ output writer functionality

[nam20485]

Essentially the "opposite" side of the parser. Once a design has been loaded, and possible modified, write the in-memory data model back out to an ODB++ file archive.

When used as shared library, the consuming application can modify the in-memory data model directly. But for use via the REST API, REST API endpoints would need to be added to POST changes back to the library's in-memory data model. Also need endpoints to tell the library to write the file out.

• [ ] serialization from memory model
• [ ] POST/PUT REST endpoints