Add support for hyphens in error message paths

This fix adds support for hyphens in filesystem paths when detecting error messages in build output.

Example message that the old regex couldn't find:

```
/Users/mildmojo/are-you-kidding-me/Assets/Popup.cs(9,15)  error:CS1519  Unexpected symbol `;' in class, struct, or interface member declaration
```

:cactus: