Began migrating action engine to async

To suspending actions to await user input

app/imports/api/engine/actions/getUserInput.js

@@ -0,0 +1,28 @@
+import ActiveActions from '/imports/api/creature/actions/ActiveActions';
+
+export default async function getUserInput(questions, actionContext) {
+  const activeActionId = actionContext.activeActionId;
+  // Set the questions on the active action
+  ActiveActions.update(activeActionId, {
+    $set: { questions },
+    $unset: { answers: 1 },
+  });
+  // Wait for answers
+  return new Promise((resolve, reject) => {
+    const observerHandle = ActiveActions.find({
+      _id: activeActionId
+    }).observeChanges({
+      changed(id, fields) {
+        // Only watch for answers
+        if (!fields.answers) return;
+        // Stop watching
+        observerHandle.stop();
+        // Give answers
+        resolve(fields.answers);
+      },
+      removed() {
+        reject('Active action was deleted')
+      },
+    });
+  });
+}