Merge branch 'devs/q66/eolian_gen_next'

Merge branch 'devs/q66/eolian_gen_next'

This merges a rewritten Eolian C generator which replaces the previous
generator. The old generator did not properly reflect the design choices taken
in the Eolian library, which resulted in a sub-par codebase that was a lot more
complicated than it had to be which resulted in worse maintainability.

The new generator aims to remedy that; it has much simpler design that relies
on the Eolian library more and doesn't take certain design choices that were
made previously.