SetupWizard: Conditionally run account setup

If the package defined by cm_account_type (which can be overlayed)
exists, then add CyanogenSettingsPage. Otherwise, omit.

PS3: On the cyngn side, the account type and package name don't match. Added a new string to overlay.

Change-Id: I15e032e21281aaf51ca32ac9cc0861e033201f19

src/com/cyanogenmod/setupwizard/util/SetupWizardUtils.java

@@ -199,6 +199,16 @@ public class SetupWizardUtils {
         return AccountManager.get(context).getAccountsByType(accountType).length > 0;
     }
 
+    public static boolean isPackageInstalled(Context context, String packageName) {
+        PackageManager pm = context.getPackageManager();
+        try {
+            pm.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES);
+            return true;
+        } catch (PackageManager.NameNotFoundException e) {
+            return false;
+        }
+    }
+
     public static void disableSetupWizard(Context context) {
         disableComponent(context, context.getPackageName(),
                 "com.cyanogenmod.setupwizard.ui.SetupWizardActivity");