* Move all focus-related work arouns to NewPipeRecyclerView
* Try to pass focus within closer parents first
* Do small arrow scroll if there are not more focusables in move direction
GridLayoutManager is buggy - https://issuetracker.google.com/issues/37067220:
it randomly loses or incorrectly assigns focus when being scrolled via
direction-based navigation. This commit reimplements onFocusSearchFailed()
on top of scrollBy() to work around that problem.
Ordinary touch-based navigation should not be affected.
