Combine changes limit and time period selectors

Combine changes limit and time period selectors

- Combine number of results and the time period panels.
- Add gear/settings icon.
- Make the "View newest changes" link more prominent, by moving
the indicator into the same row as "Live updates" button and
the combined number of results and time period selector.
- Add reload icon to "View newest changes" link.

Bug: T177926
Change-Id: I793bfaa91a7823bdec7af5816d9398d2a993262a