GitLab

If a VERSION is not specified, this will generate a version string that
represents the state of the repo.  For example `0.1.21-12-gffaf52e1-dirty`
representing 12 commits away from 0.1.21 tag, on commit gffaf52e1
and the tree is dirty.

This also refines the build process for the ext_server build.

Run the server.cpp directly inside the Go runtime via cgo
while retaining the LLM Go abstractions.