feat: add subscriber later binding as submodule

Author: Sergio Alvarenga

.gitmodules

@@ -6,3 +6,7 @@
 	path = packages/external-plugins/oscd-plugins
 	url = https://github.com/sprinteins/oscd-plugins
 	branch = gh-pages
+[submodule "packages/external-plugins/scl-editor"]
+	path = packages/external-plugins/scl-editor
+	url = https://github.com/danyill/scl-editor
+	branch = gh-pages

packages/compas-open-scd/public/js/plugins.js

@@ -111,6 +111,13 @@ export const officialPlugins = [
     default: false,
     kind: 'editor',
   },
+  {
+    name: 'Subscribe (Later Binding)',
+    src: '/external-plugins/scl-editor/plugins/oscd-subscriber-later-binding/oscd-subscriber-later-binding.js',
+    icon: 'link',
+    default: false,
+    kind: 'editor',
+  },
   {
     name: 'Open project',
     src: '/src/menu/CompasOpen.js',