Add all of iogamaster modules

lib/module/default.nix

@@ -0,0 +1,15 @@
+{ lib, ... }:
+with lib;
+rec {
+  mkOpt =
+    type: default: description:
+    mkOption { inherit type default description; };
+
+  mkOpt' = type: default: mkOpt type default null;
+
+  mkBoolOpt = mkOpt types.bool;
+
+  mkBoolOpt' = mkOpt' types.bool;
+
+  mkEnableOpt = mkBoolOpt' false;
+}