Modify build tooling to allow building an eopkg as a stone.yaml

[TraceyC77]

Modify build tooling so we can build eopkgs for Solus as Stone packages. Adopt Serpent build definitions. Convert repo to stone.yaml. Most packages can do a 1:1 conversion.

Also see #89 Implement serpent macros piecemeal to make it easier to auto-port package.yml to stone.yaml format

cc @sheepman4267