[Azoth CH] Added HistoryViewEventFilter for #1773.
[Azoth CH] Handle background URL requests, closes #1773.
[TL] Refactored stuff to Move{Up,Down}().
[TL] Wrap into a scroll view for #1774 and for #1775.
[TL] Smaller margins.
[TL] Code style.
[TL] Properly handle up/down keys.

Probably closes #1774 and closes #1775/