add pipewire.desktop autostart and configure SDDM Wayland compositor

Place pipewire.desktop in root-overlay /etc/skel/.config/autostart/
so PipeWire starts via XDG autostart on login via the patched
artix-pipewire-launcher (now supports dinit in our pipewire fork).

Configure SDDM [Wayland] section with kwin_wayland compositor
command for a Wayland-native greeter display.

Includes:
- buildiso: antergos theme symlinked as artix for prepare_grub
- profile.yaml: dinit-user-spawn -> userspawn-dinit, added
  dbus-dinit-user, pipewire-pulse-dinit, userspawn-dinit to livefs,
  antergos-lsb-release
- services-artix.conf: dinit-user-spawn -> userspawn
- basestrap.conf: xlibre-xserver for online install
- pacman.conf: IgnorePkg xorg-server to avoid conflict with xlibre
- sddm.conf: Wayland compositor command
- common.yaml: cleanup (dedup lsb-release, vi->ex-vi-compat,
  remove artix-grub-theme, jack2, noto-fonts-emoji)
- iso-x86_64.conf: IgnorePkg xorg-server for ISO build

iso-profiles/antergos/profile.yaml

@@ -21,6 +21,7 @@ live-session:
 rootfs:
   packages:
     - antergos-release
+    - antergos-lsb-release
     - qt6-multimedia-ffmpeg
     - falkon
     - vlc
@@ -45,7 +46,7 @@ rootfs:
       - pipewire-dinit
       - pipewire-pulse-dinit
       - wireplumber-dinit
-      - dinit-user-spawn
+      - userspawn-dinit
       - syslog-ng-dinit
       - sddm-dinit
       - networkmanager-dinit
@@ -118,8 +119,12 @@ livefs:
       - sddm-dinit
       - syslog-ng-dinit
       - dbus-dinit
+      - dbus-dinit-user
       - pipewire-dinit
+      - pipewire-pulse-dinit
       - wireplumber-dinit
+      - userspawn-dinit
+      - elogind-dinit
     openrc:
       - antergos-live-openrc
     runit: