Fix cross references in GPluginGtk3

Review Request #1002 — Created Oct. 6, 2021 and submitted — Latest diff uploaded

Information

gplugin/gplugin
default

Reviewers

  • Clean up cross references in GTK plugin display widget
  • Fix cross-references in GTK3 store
  • Fix cross-references in the GTK view

Checked the built docs for link-like things.