[core] Add a list of links to project

[aalmiray]

Each link should have these properties:

• url.
• type. One of [homepage, bugtracker, faq, help, donation, translate, contact, vcs-browser, contribute]

If no link with type homepage is found then project.website will be used if defined.
if no link with type bugtracker is found then release.*.issueTrackerUrl will be used instead.

Based on appstream metadata https://www.freedesktop.org/software/appstream/docs/chap-Metadata.html#tag-url

[aalmiray]

This section will look like this

  links:
    homepage: https://acme.com/app
    bugTracker: https://vcs.acme.com/app/issues
    vcsBrowser: https://vcs.acme.com/app
    faq: https://acme.com/app/faq
    help: https://acme.com/app/help
    donation: https://acme.com/app/donations
    translate: https://acme.com/app/tr
    contact: https://acme.com/app/contact
    contribute: https://acme.com/app/contribute