preferences: add user oriented features

- notifications on incoming calls
- history limitation / deletion
- bring app to foreground

Refs #66840

Change-Id: I847d45337f438140904523d9306583c72a8f3625
diff --git a/GeneralPrefsVC.h b/GeneralPrefsVC.h
index a0e496b..ef059ae 100644
--- a/GeneralPrefsVC.h
+++ b/GeneralPrefsVC.h
@@ -34,6 +34,7 @@
 
 @interface GeneralPrefsVC : NSViewController {
 
+    NSTextField *historyChangedLabel;
 }
 
 @end