add spectacle config, add spotify, fix cinny video playback with gstreamer

refactor some stuff to look nicer and have more structure too

modules/nixos/services/gns3/default.nix

@@ -0,0 +1,29 @@
+{
+  lib,
+  pkgs,
+  config,
+  namespace,
+  ...
+}:
+with lib;
+with lib.${namespace};
+let
+  cfg = config.${namespace}.services.gns3;
+in
+{
+  options.${namespace}.services.gns3 = {
+    enable = mkBoolOpt false "GNS3";
+  };
+
+  config = mkIf cfg.enable {
+    services.gns3-server.enable = true;
+    services.gns3-server.ubridge.enable = true;
+    services.gns3-server.dynamips.enable = true;
+
+    environment.systemPackages = with pkgs; [
+      dynamips
+      gns3-gui
+    ];
+  };
+
+}