ui: add call screen interface

- in/out animation
- switch calls in conversation tree
- basic controls over call: accept/hangup/hold
- video

Refs #67611

Change-Id: I1d302d2539cb473e27ea469781b72f44963eb0a0
diff --git a/ConversationsViewController.h b/ConversationsViewController.h
index 2d62f7a..09d4e3b 100644
--- a/ConversationsViewController.h
+++ b/ConversationsViewController.h
@@ -34,12 +34,9 @@
 #import "QNSTreeController.h"
 
 @interface ConversationsViewController : NSViewController <NSOutlineViewDelegate> {
-    NSOutlineView *conversationsView;
-}
 
-@property QNSTreeController *treeController;
-@property (assign) IBOutlet NSOutlineView *conversationsView;
+}
 
 @end
 
-#endif // CONVERSATIONSVC_H
\ No newline at end of file
+#endif // CONVERSATIONSVC_H