Add unencrypted payloads

Author: erayd

meshtastic/mesh.proto

@@ -1052,6 +1052,8 @@ message Routing {
  * inside a radio packet (because from/to are broken out by the comms library)
  */
 message Data {
+  reserved 10; // Used for deprecated field
+
   /*
    * Formerly named typ and of type Type
    */
@@ -1106,6 +1108,11 @@ message Data {
    * Bitfield for extra flags. First use is to indicate that user approves the packet being uploaded to MQTT.
    */
   optional uint32 bitfield = 9;
+
+  /*
+   * Magic number used to verify that a decoded packet is actually supposed to be unencrypted
+   */
+  uint32 tx_unencrypted = 11;
 }
 
 /*