Use BetterFolderBrowser for choosing a folder.

[DeathWrench]

Also updates ILMerge and Newtonsoft.Json.

[Rosalie241]

I'm not sure I like the idea of introducing another dependency, especially because I consider this project finished and will only really update it if it breaks

[DeathWrench]

I could've sworn you sent me a version that did this before. There's 3 dependencies that do this that I saw: https://github.com/scottwis/OpenFileOrFolderDialog - Too cold: 13 years not updated... perhaps it works, I never tried it. https://github.com/ookii-dialogs/ookii-dialogs-winforms - Too hot: Too many features, when only want this one thing. https://github.com/Willy-Kimura/BetterFolderBrowser - The porridge is just the right temperature. Before: After: I could try to do it without adding the dependency, it was just easier to do it this way.