GalleryItem refactoring. Adds InfoGalleryItem a widget that displays info about a repository or a library.
ItemInfo refactoring, now it's used for repositories and libraries.
Adds GetLibraryThumbnail action and assets for LibraryItems.
Fixes keyboard event capture.
Proper back behavior.
Merge pull request #769 from RotaruDan/catchBackKey

Fixes keyboard event capture.
Merge pull request #767 from RotaruDan/repoFixes

LibrariesView redesign.
Added images and changed i18n.
Added widget with send emails options
Added credits view
Added about panel
minor fixes