Highlight row (instead of ripple) when come from search.

- Moved HighlightableAdapter to its own class
- Replaced ripple with blue background
- Bluebackground only stays for 5 seconds. After that it's replaced by
  ?attr/selectableBackground

Misc fixes.

- Fix NPE in UserSettings
- Update char limit on a new string

Change-Id: I4687e54e71fd7b9243f520b7630563df58be23d4
Fixes: 71715698
Fixes: 72761974
Test: robotests

res/values/ids.xml

@@ -17,7 +17,7 @@
 */
 -->
 <resources>
-    <item type="id" name="preference_highlight_key" />
+    <item type="id" name="preference_highlighted" />
 
     <item type="id" name="lock_none" />
     <item type="id" name="lock_pin" />

res/values/strings.xml

@@ -6145,7 +6145,7 @@
     <!-- User settings -->
     <skip/>
 
-    <!-- User settings screen title [CHAR LIMIT=25] -->
+    <!-- User settings screen title [CHAR LIMIT=40] -->
     <string name="user_settings_title">Multiple users</string>
     <!-- User settings header for list of users and profiles [CHAR LIMIT=40] -->
     <string name="user_list_title">Users &amp; profiles</string>