Expose font weight adjustments & correct current-config refcount.

Finish initial redraft

Write init/finalize & pattern language bindings, haskell-side!

Draft C-side wrappers for various FontConfig APIs.

Continue implementing C-side language bindings.

Encode & decode charsets on C side (fix Haskell side)

Initialize C components, including vendored CMP

Datamodel FontConfig in Haskell.

Start rewrite from scratch.