1. Add new retval namespace which contains OK and FAIL returnvalue
2. Also contains makeCode constexpr function
3. Mark HasReturnvaluesIF::makeReturnCode deprecated

This prevents from having to implement an interface just to use a shorter
version of the general returnvalues. A namespace is better suited for this
I think

@@ -16,1 +13,3 @@
-    this->messageSize = this->HEADER_SIZE + size;
+    : messageSize(MessageQueueMessage::HEADER_SIZE + size) {
+  if (size <= MessageQueueMessage::MAX_DATA_SIZE) {
+    std::memcpy(internalBuffer + MessageQueueMessage::HEADER_SIZE, data, size);

@@ -13,7 +13,6 @@ ReturnValue_t MessageQueueSenderIF::sendMessage(MessageQueueId_t sendTo,
                                                 MessageQueueMessageIF* message,
                                                 MessageQueueId_t sentFrom, bool ignoreFault) {
   return MessageQueue::sendMessageFromMessageQueue(sendTo, message, sentFrom, ignoreFault);
-  return returnvalue::OK;

@@ -148,4 +148,2 @@
   // Init our dummy packet and correct endianness of object ID before
   // sending it back.
-  WiretappingPacket TmPacket(DeviceHandlerMessage::getDeviceObjectId(reply), data);
-  TmPacket.objectId = EndianConverter::convertBigEndian(TmPacket.objectId);

@@ -35,3 +34,1 @@
-  data.data_field.service_subtype = subtype;
-  TmPacketMinimal testPacket((uint8_t*)&data);
-  testPacket.setAPID(apid);
+  mintm::MinimalPusTm data{};

@@ -27,3 +30,3 @@
 
  private:
-  uint8_t subService;
+  uint8_t subService{};

@@ -12,3 +12,3 @@
  * addTimeStamp may be called in parallel from a different context.
  */
-class TimeStamperIF {
+class TimeStamperIF : public SerializeIF, public TimeStampIF {