Makes sure the restricted user does not see Wifi Preferences
or Saved Networks activity. Also fixes a bug where the progress
bar is displayed starting the activity in Guest mode, and does not go
away. LinkablePreference is changed to make sure titles can be
multi-lined.
Bug: 35317523
Bug: 35318292
Test: to be done in b/35324506
Change-Id: I4a07a2ab3a83c3adaf87226969fd6f16e41c9419
Removed the gear icon that links to ConfigureWifiSettings activity,
and added links to ConfigureWifiSettings and SavedAccessPointSettings.
Included these links in the wifi disabled screen.
Also refactored code to have dividers between wifi list and other settings, and
changed refresh menu item to a button.
Bug: 34518148
Bug: 33110624
Test: Manual inspection
Change-Id: Ie40935f553faea59b7a76fc050d970d431cef5ad