Add options to customize the .NET preview control (winforms)

We would like to have new functions or properties to customize the following things of the preview control.

- add option to change the standard width of the thumbnail bar
3-column-width.png


- change the highlight color (blue) of the page thumbnail
2-highlight-color.png


- change the highlight color (blue) of the page preview area
1-highlight-color.png


 

In the backlog for LL24. Promoting to planned state.