PT Run: revert UI style to defaults

[Jay-o-Way]

@niels9001 I see many custom styles, which are very old. I strongly recommend to remove Styles.xaml and any style we do need (like SubtleButtonStyle) can be set in ResultList.xaml (same for LauncherControl)

I would be happy to take this up! 🙂

Issues to solve

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1. ListView > commandButtons: Selector bar is inappropriate; use different control

Concept

[Jay-o-Way]

Note to self: Replacing ListView with a ItemsControl seems nice, but has issues with TabStop etc. What's the best control for this?