[libadwaita] (8 commits) Non-fast-forward update to branch wip/exalm/background-colors

[Alexander Mikhaylenko <alexm src gnome org>]

The branch 'wip/exalm/background-colors' 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:

  a1f3c5d... stylesheet: Make everything recolorable
  44766fc... stylesheet: Split base and defaults

Commits added to the branch:

  716bfbb... stylesheet: Remove notebook header background
  cd5084e... stylesheet: Use header bar styling for search bar
  a716b81... stylesheet: Remove $dark_fill
  5bcb32f... stylesheet: Move $shade_color to _colors.scss
  238acd6... stylesheet: Add .inline style class for tab bars
  da9f326... stylesheet: Make everything recolorable
  a3e6212... stylesheet: Stop referring to color variables from _default
  f8d180a... stylesheet: Split base and defaults