Settings: Prevent GC from grabbing observer

Change-Id: I3c35b18550243c5e31364cac5e6ccc9ec41201ec
Reorder Quiet hours menu a little

Change-Id: I9d568ccd9840cfa18379770235b82e410c5f3651
Settings: Don't match action bar parent for search on tablets.

Also adjust IME flags to
a) show the search icon as action key and
b) to not appear fullscreen in landscape

Change-Id: I9bc9851d39aa4d6dbed40df63dd4ea8df6f4c3f9
Settings : Scroll to preference on search and highlight

Change-Id: I93c4106d022b416205cc33cf5dbdf5d7635a002a
Highlight search string match.

Change-Id: I72c0380512028674c91f287325f221a686a4821d
Improve search performance.

The normalization regex is slow (5-10ms per entry on mako), so better
pre-cache it. Also cache the icons, as the number of icons is vastly
smaller than the number of potential search results, so they'll be
reused very often.

The regex change alone brings the duration of a single filter run down
to ~20ms from ~1200ms on mako.

Change-Id: Ia0fa9c554d0d585a52c8a2b87eecbf045388c961
Settings: Quiet hours fix (2/2)

Change-Id: I762aac6e4a862f836649c193c632d581177b0eef