Use an alternative YAML library

[bfabio]

https://github.com/go-yaml/yaml seems almost abandoned, we should investigate for an alternative.

In general, there are several places in the code where we needed to workaround the lack of features of the library with subpar solutions, fe. the code that tries to figure out where in the file, in terms of line and column numbers, an errors is.

This can be an opportunity to solve those cases as well.