First attempt for morrowind support

I wanted to add morrowind support and I was having trouble with it.

1) There are no groups so in main that could be skipped.
2) The header is 16 bytes
3) The length byte for everything is 4 bytes and not 2

I altered gameFormat but I'm not sure if that is ideal.
```Python
    if dest = 'morrowind':
        dataLenByte = 4
    else:
        dataLenByte = 2
```
I think that syntax is right not sure.  I wanted to have the length byte become a variable.