Have line and columns number in the wrapped errors

[bfabio]

Errors are just arrays of strings in an errorformat friendly structure, eg:

publiccode.yml:36:1: error: developmentStatus: developmentStatus must be one of the following: "concept", "development", "beta", "stable" or "obsolete"
publiccode.yml:48:3: warning: legal.authorsFile: This key is DEPRECATED and will be removed in the future. It's safe to drop it
publiccode.yml:12:5: warning: description.en.genericName: This key is DEPRECATED and will be removed in the future. It's safe to drop it

maybe we can turn them into objects with richer and typed info, which would allow us access to line and column numbers without the need to parse the error string.