QPhotoRec: Improve File Format Window

[jonasfroeller]

The file format selection window is minimalistic and annoying to navigate. These two features would make it so much better:

• Add a search bar for quickly finding desired file extensions.
• Include an option to select all video formats, image formats...

[Tarek-Hasan]

I mentioned no 2 issue of yours almost two years ago in #121, but no response. This simple feature would improve usability of the app.