treewide: include PipeWire op and enforce PulseAudio check

This fully replaces PulseAudio with PipeWire and enforces the PulseAudio check and error message. The pipewire-pulse daemon is handled in the NixOS module.

Closes #26.

Signed-off-by: Ophestra <cat@gensokyo.uk>

test/configuration.nix

@@ -134,7 +134,6 @@
         enablements = {
           wayland = false;
           pipewire = false;
-          pulse = false;
         };
       };
 
@@ -154,7 +153,6 @@
         enablements = {
           dbus = false;
           pipewire = false;
-          pulse = false;
         };
       };
 
@@ -170,7 +168,6 @@
         enablements = {
           dbus = false;
           pipewire = false;
-          pulse = false;
         };
       };
 
@@ -203,7 +200,6 @@
           x11 = true;
           dbus = false;
           pipewire = false;
-          pulse = false;
         };
       };
 
@@ -223,7 +219,6 @@
         enablements = {
           dbus = false;
           pipewire = false;
-          pulse = false;
         };
       };
 
@@ -238,7 +233,6 @@
           x11 = false;
           dbus = false;
           pipewire = false;
-          pulse = false;
         };
       };
     };