Revamping the GIMP Text Engine HarfBuzz and OpenType

GIMPs typographic engine is currently limited by legacy GTK3 and Pango constraints. This project overhauls the text backend by directly integrating HarfBuzz to extract font data and advancing GIMPs experimental text layout library. Deliverables include migrating the font chooser to modern GTK list models, grouping fonts by WWS families, and introducing modular on canvas UI controls for variable font axes and OpenType features.