Customizable Dark Design

After I released the latest version I received a lot of positive feedback and feature requests from the users. The most often mentioned feature request was the support for a dark theme/design, and as I take your feature request seriously, I will add the support in the next version.

As I had to touch a lot of the source code to enable the support for the dark theme, I decided to extend it. Therefore I didn’t only add a dark theme, I also added the option to fully customize the colors of the design.