Support Map and Set, with postMessage, when workers are disabled

The `LoopbackPort` currently doesn't support `Map` and `Set`, which it should since the "structured clone algorithm" used in browsers does support both of them; please see https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Structured_clone_algorithm#supported_types

src/display/api.js

@@ -1656,8 +1656,24 @@ class LoopbackPort {
         cloned.set(value, result);
         return result;
       }
+      if (value instanceof Map) {
+        result = new Map();
+        cloned.set(value, result); // Adding to cache now for cyclic references.
+        for (const [key, val] of value) {
+          result.set(key, cloneValue(val));
+        }
+        return result;
+      }
+      if (value instanceof Set) {
+        result = new Set();
+        cloned.set(value, result); // Adding to cache now for cyclic references.
+        for (const val of value) {
+          result.add(cloneValue(val));
+        }
+        return result;
+      }
       result = Array.isArray(value) ? [] : {};
-      cloned.set(value, result); // adding to cache now for cyclic references
+      cloned.set(value, result); // Adding to cache now for cyclic references.
       // Cloning all value and object properties, however ignoring properties
       // defined via getter.
       for (const i in value) {