Features for specific bank format export

Hi, I've implemented a few specific features, which are required for export format I am targeting for:

 * Custom fill char for fields (e.g. zero filled, right justified account number)
 * Column length overflow data validation
 * Option to disable trimming trailing spaces in the line

It would be awesome if you can push them to next nuget package, so I won't need to use local nuget feed for this.