Draft: XFCE Fixes

This branch addresses several deficiencies in XFCE packaging:

• dbus-x11 is required by xfce4-session to run correctly.
• XFCE theming was previously nonexistent. Now it exists.

I plan to incorporate libadwaita and adwaita-gtk3, however the following needs to happen:

• cairo >= 1.18.2
• gtk4 >= 4.18.0

added 7 commits

• 87d788bf - user/cairo: upgrade to 1.18.4
• c68c2953 - user/harfbuzz: upgrade to 10.4.0
• 1124319d - user/fontconfig: upgrade to 2.16.0
• bc143c59 - user/pango: upgrade to 1.56.3
• 49b68f6b - user/gstream: upgrade to 1.26.0
• 3cc40b2b - user/gst-plugins-base: upgrade to 1.26.0
• e82da7af - user/gst-plugins-good: upgrade to 1.26.0

Compare with previous version