added message select menus

structures/messages/MessageActionRow.js

@@ -0,0 +1,20 @@
+
+export class MessageActionRow {
+    /** @type {Object[]} */
+    components;
+
+    addComponent(comp) {
+        if (this.components.length > 5) throw "MAXIMUM SIZE REACHED!";
+        this.components.push(comp);
+    }
+
+    toObj() {
+        const o = {type: 1, components: []};
+        for (const k of this.components) {
+            o.components.push(k.toObj());
+        }
+        return o;
+    }
+
+    constructor() { this.components = []; }
+}