Build tapback support into the meshpacket

mesh.proto

@@ -712,6 +712,18 @@ message MeshPacket {
    * Describe if this message is delayed
    */
   Delayed delayed = 15;
+
+  /*
+   * If set, this message is intened to be a reply to a previously sent message with the defined id.
+   */
+  fixed32 reply_id = 16;
+
+  /*
+   * Defaults to false. If true, then what is in the payload should be treated as an emoji like giving
+   * a message a heart or poop emoji.
+   */
+  bool is_tapback = 17;
+
 }
 
 /*