Improving some ebook rendering

[freddofrog]

Hi,

I have noted some issues with freda and e-books rendering in particular some Microsoft Press-sponsored e-books.

Issues noted are:

- "Tab stops"  that represent code indents not being displayed correctly
- C# elements such as Console.WriteLine($"Value of copy is {weddingAnniversary}"); missing key display elements (i.e. the {weddingAnniversary} item ). 

Please refer to the attached .jpeg.

Can these issues please be looked at in future releases?

Regards,

Freddo