theme: load icons as Gtk does with fallback and RTL support

Forwarded: yes, https://gitlab.gnome.org/GNOME/mutter/merge_requests/62

Gbp-Pq: Name theme-load-icons-as-Gtk-does-with-fallback-and-RTL-suppor.patch

theme: use gtk_render_icon_suface to paint button icon

This will properly take care of the icon transformations
and of the shadow.

Fixes #100

Bug: https://gitlab.gnome.org/GNOME/mutter/issues/100
Bug-Ubuntu: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1764558
Forwarded: yes, https://gitlab.gnome.org/GNOME/mutter/merge_requests/62

Gbp-Pq: Name theme-use-gtk_render_icon_suface-to-paint-button-icon.patch

mutter (3.30.2-5) unstable; urgency=medium

  * d/p/clutter-Avoid-rounding-compensation-when-invalidating-2D-.patch,
    d/p/clutter-Fix-offscreen-effect-painting-of-clones.patch:
    - Fix offscreen-effect painting of clones in zoom mode (LP: #1767648,
      LP: #1779615)
  * d/p/cogl-auto-texture-Avoid-a-double-free-crash.patch,
    d/p/clutter-offscreen-effect-Disable-if-no-texture.patch:
    - Fix crash in dual monitor setup and gdm activation (LP: #1790525,
      LP: #1795774)

[dgit import unpatched mutter 3.30.2-5]

Import mutter_3.30.2-5.debian.tar.xz

[dgit import tarball mutter 3.30.2-5 mutter_3.30.2-5.debian.tar.xz]

Import mutter_3.30.2.orig.tar.xz

[dgit import orig mutter_3.30.2.orig.tar.xz]