Optimize for tablet sized screens

[cemrich]

• [ ] Make life cards wider and give them some horizontal space
• [ ] display mediathek filter next to mediathek list (not as bottom sheet)
• [ ] give mediathek detail view some horizontal padding
• [ ] remove weird padding between mediathek show and its thumbnail
• [ ] use horizontal space in downloads tab more effectively
• [ ] settings screen is to wide (Needs some padding? How do other apps display settings on wide screens?)
• [ ] padding for channel oder screen
• [ ] about screen too wide
• [ ] changelog and faq too wide