smorokin

Results 2 issues of smorokin

### Prerequisites - [x] I have written a descriptive pull-request title - [x] I have verified that there are no overlapping [pull-requests](https://github.com/SixLabors/ImageSharp/pulls) open - [x] I have verified that I...

formats:bmp

I have improved the export and import of extension objects to xml. Currently only tested with a b&r plc. While testing I found that the the following entries are missing...