Unify general settings

Add mechanism for Email to subclass General Prefs, to remove archive-related prefs

Also tidy up some resources

b/9566150

Change-Id: I7f367302dd8c62102e227800bc7bf037d38fb788
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 31c4a3b..4b990fd 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -701,13 +701,7 @@
     <!-- General preference: Label of the setting for the direction to move to
          when deleting the current message.
          Options contain "newer message","older message", etc. [CHAR LIMIT=32] -->
-    <string name="auto_advance_label">Auto-advance</string>
-
-    <!-- General preference: Description of the setting for the direction to move to
-         when deleting the current message.
-         Options contain "newer message","older message", etc. [CHAR LIMIT=64] -->
-    <string name="auto_advance_summary">Choose which screen to show after you
-         delete a message</string>
+    <string name="preference_advance_to_title">Auto-advance</string>
 
     <!-- Title of the dialog that appears the first time they perform an action that would cause
          auto advance logic to fire [CHAR LIMIT=70] -->
@@ -1159,9 +1153,6 @@
         <item>never</item>
     </string-array>
 
-    <!--  Settings screen, auto advance title  [CHAR LIMIT=200]-->
-    <string name="preference_advance_to_title">Auto-advance</string>
-
     <!-- Settings screen, title of "Clear search history" menu item -->
     <string name="clear_history_title">Clear search history</string>
     <!-- Message shown in toast when the user taps "clear search history" in general preferences. [CHAR LIMIT=50] -->