Apply new action button visual design

- Add some icon resources.
- Add icon for each button in action button preference.
- Update "Enable" and "Disable" string to "Install" and "uninstall".
- Remove unused string.
- Add divider between entity header and action buttons.

Test: visual, robotest
Fixes: 119203074
Bug: 116346008
Change-Id: Ib8d7aeb2943d39d257e977b84f165f002bf47559

src/com/android/settings/wifi/details/WifiDetailPreferenceController.java

@@ -278,6 +278,7 @@ public class WifiDetailPreferenceController extends AbstractPreferenceController
 
         mButtonsPref = ((ActionButtonPreference) screen.findPreference(KEY_BUTTONS_PREF))
                 .setButton1Text(R.string.forget)
+                .setButton1Icon(R.drawable.ic_settings_delete)
                 .setButton1Positive(false)
                 .setButton1OnClickListener(view -> forgetNetwork())
                 .setButton2Text(R.string.wifi_sign_in_button_text)