template: |sort in template creates enum sorted by name and not by value

From: https://github.com/bluerobotics/ping-protocol/issues/108

We are sorting the template in alphabetic order and not with #id number.
For a better code reading, we should move it somehow to sort the template by #id.

What is happening with `|sort`:
```cpp
enum msg_CommonMessage_id {
Ack = 1,
Ascii_text = 3,
Nack = 2,
Protocol_version = 5,
Request = 4,
};
```
without `|sort`:
```
enum msg_CommonMessage_id {
Ack = 1,
Nack = 2,
Ascii_text = 3,
Request = 4,
Protocol_version = 5,
};
```

Originally this was an attempt do create the same output with python2 and python3.