Move vm clanModules to lib

lib/default.nix

@@ -8,4 +8,14 @@
   jsonschema = import ./jsonschema { inherit lib; };
   modules = import ./description.nix { inherit clan-core; };
   buildClan = import ./build-clan { inherit clan-core lib nixpkgs; };
+
+  vm-user = ./vm-user;
+  graphical = ./graphical;
+  xfce-vm = {
+    imports = [
+      ./vm-user
+      ./graphical
+      ./xfce-vm
+    ];
+  };
 }