libcue: use CUE from C and C-like languages

This is a work in progress, expect constant churn and breakage.

Building

Building both as a static archive and a shared object is supported.

go build -o libcue.so -buildmode=c-shared
go build -o libcue.a -buildmode=c-archive

Using

Include cue.h in your C code and link with libcue (either statically or dynamically).

Issue tracking

Please raise all issues in the main CUE repository, giving the title of the issue a libcue: prefix.