Move some wifi tracking code to SettingsLib

Move tracking of which networks are available/saved and their state
over to SettingsLib to share it with Quick Settings.

Bug: 19180466
Change-Id: Iaeef06b26da8cb38e1ba09a7d105d04d499dc181

src/com/android/settings/wifi/WifiDialog.java

@@ -17,6 +17,7 @@
 package com.android.settings.wifi;
 
 import com.android.settings.R;
+import com.android.settingslib.wifi.AccessPoint;
 
 import android.app.AlertDialog;
 import android.content.Context;