[pango] (10 commits) ...Merge branch 'text-transform-3' into 'main'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  bf5e071... markup: Add a text transform attribute (*)
  24dfe39... layout: Text transform affects shape (*)
  230c676... tests: Handle text transform attrs (*)
  0f9c6ca... Add pango_shape_item (*)
  585a902... layout: Use pango_shape_item (*)
  e892e6e... shaping: implement text transform (*)
  7ee2886... Documentation tweaks (*)
  d1b01c8... tests: Use en_US.UTF8 instead of C (*)
  b2c3b6a... Add a test for text_transform in markup (*)
  1ac4f5d... Merge branch 'text-transform-3' into 'main'

(*) This commit already existed in another branch; no separate mail sent