Move ManageAccountsSettings into Settings.

- Add activity-alias for the Activity.
- Copy the Activity from AccountsAndSyncSettings.
- Fragmentize ManageAccountsSettings.
- Remove dependency toward AccountPreferenceBase, which is
  used in AccountsAndSyncSettings widely.
- Add missing implementation derived from AccountPrefernceBase.
- Copy dependent drawables.
- Copy dependent xmls
- Copy AccountPrefernce.java.
- Copy strings, adding CHAR LIMIT.
- Remove the logic which remove the preference when its destination
  Activity is missing. We already have the destination as
  Fragment, and it never disappear.

Change-Id: Id41c63d7064aebeaae31bcd84bf4fd20a5636dfe

src/com/android/settings/Settings.java

@@ -235,8 +235,6 @@ public class Settings extends Activity
         private void updatePreferenceList() {
             final Activity activity = getActivity();
             PreferenceGroup parent = (PreferenceGroup) findPreference(KEY_PARENT);
-            Utils.updatePreferenceToSpecificActivityOrRemove(activity, parent,
-                    KEY_SYNC_SETTINGS, 0);
             Preference dockSettings = parent.findPreference(KEY_DOCK_SETTINGS);
             if (activity.getResources().getBoolean(R.bool.has_dock_settings) == false
                     && dockSettings != null) {