News Search works... more or less

- Bing Search for News (using sites index.hu, origo.hu and hir24.hu)
works
- Search results displayed on the ArView
- Methods moved from ArView to it's ViewModel (needs more work)
- ArticleItems look needs some more work (too small items)
- Separate DisplayUrl (shorter) and Url for ArticleItems
- If use of location turned of the program displays a warning instead of
going to the AR View
- All Tiles navigates for the correct destination (to ArPage, except the
Earlier Tile which navigates to the EarlierPage)
- New EarlierPage (Pivot) for articles saved for future reading
- New Converters (BooleanToVisibility, and BooleanToSwitch (for toggle
switch localization)) in Converters folder
- Started using collapsable regions for better code readability