[gtk+] (14 commits) Non-fast-forward update to branch wip/matthiasc/font-variations

[Matthias Clasen <matthiasc src gnome org>]

The branch 'wip/matthiasc/font-variations' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  10eb5c9... Some initial support for font variations
  5f466a4... Add a font variations demo
  5a2d4af... Redo the features part of the font features demo
  3a3b8f8... Add another fun demo
  ce59245... Add new defines to config.h.meson
  72516c6... fontchooser: Small revision of the UI
  bc712a6... Implement font-variation-settings
  a1c03c5... font button: Take variations into account

Commits added to the branch:

  8581345... Remove debug spew (*)
  9620e1e... tests: Stop using gtk_font_button_get_font_name (*)
  6ff3222... font button: Drop the font-name property (*)
  559a2bf... Add a missing include (*)
  1c3f343... Remove font-name leftovers (*)
  5923264... Some initial support for font variations
  0bf72f8... Add a font variations demo
  7403ab8... Redo the features part of the font features demo
  ba92738... Add another fun demo
  d3c03bd... fontchooser: Small revision of the UI
  b346fe4... Implement font-variation-settings
  b0966b8... font button: Take variations into account
  5aedd36... wip: introduce font chooser levels
  ac1afba... fontbutton: Remove show-font and show-size

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