Fragmentize ZoneList, which is needed in DateTimeSettings refactoring.

- remove old ZonePicker and rename ZoneList to ZonePicker, as
  the name is really confusing (see LocalePicker)
- Make the new ZonePicker fragment.
- remove dependency toward "ZoneList" class.
-- AndroidManifest.xml does not allow the other components to
   access ZoneList directly, so it would be ok to remove without
   using activity-alias.
-- Noticed there is a significant code duplication between
   DateTimeSettings and DateTimeSettingsActivity. I'll work on it
   later.
- add DateTimeSettingsSetupWizardXL class, which is not used yet,
  but will be in the near future.
-- It is not recognized by AndroidManifest.xml

Change-Id: Id26152a3d560f9e0bd84afdf3e1c5101f0e166b4

res/values/strings.xml

@@ -492,7 +492,7 @@
     <!-- mobile network settings screen, setting option summary text -->
     <string name="sum_carrier_select">Select a network operator</string>
 
-    <!-- Date and time settings -->
+    <!-- Date and time settings --><skip />
     <!-- Main Settings screen setting option name to go into the date and time settings-->
     <string name="date_and_time_settings_title">Date &amp; time</string>
     <!-- Main Settings screen setting option summary text for the item to go into the date and time settings. -->
@@ -2685,4 +2685,13 @@ found in the list of installed applications.</string>
     <!-- The message show above available networks when connection is established.
          Used in Wifi Setup For Setup Wizard with XL screen. -->
     <string name="wifi_setup_status_connected">Connected</string>
+
+    <!-- Do not translate. Just a temprary stub. -->
+    <string name="time_zone_manual_select_enabler" translatable="false">Experimental text</string>
+    <!-- Do not translate. Just a temprary stub. -->
+    <string name="date_time_manual_select_enabler" translatable="false">Experimental text</string>
+    <!-- Do not translate. Just a temprary stub. -->
+    <string name="date_time_setup_skip" translatable="false">Skip</string>
+    <!-- Do not translate. Just a temprary stub. -->
+    <string name="date_time_setup_next" translatable="false">Next</string>
 </resources>