Define new interface and structure for Test Unit Engine

```
Think about:
1. Are there possible to link several TUE in one DLL?
2. It is needed to plain C functions interface?
3. Where TUE's DLLs must be situated?
4. How pass to yUnit process info about needed TUEs for using/loading?
```

Original issue reported on code.google.com by `MuteSpi...@gmail.com` on 10 Aug 2012 at 6:13
