Feature request: symbol.type = original

> BibTool normalizes string names before printing. 

Can this be switched off, e.g., by adding

```
symbol.type = original
```

Since BiBTeX operates case-insentive, that should be doable, and it can greatly help readability when your macro definitions use CamelCase (and you want to keep these).

An alternative would be

```
preserve.macro.case = on
```