UI: update chat view UI

Now view used for sending and receiving messages during the call (ChatView)
is the same as for regular ConversationView.
Also this commit fix two problems:
1)remove black imprints of text views, that appeared after window resizing
2)set status "read" for messages arriving during call, so they don't appear
in SmartList as unread.

Change-Id: I6d0cb79878395d28cfc93491a9d4cab42ed89192
Reviewed-by: Anthony Léonard <anthony.leonard@savoirfairelinux.com>
diff --git a/src/MessagesVC.h b/src/MessagesVC.h
new file mode 100644
index 0000000..6b5430f
--- /dev/null
+++ b/src/MessagesVC.h
@@ -0,0 +1,33 @@
+/*
+ *  Copyright (C) 2015-2017 Savoir-faire Linux Inc.
+ *  Author: Kateryna Kostiuk <kateryna.kostiuk@savoirfairelinux.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.
+ */
+
+#import <Cocoa/Cocoa.h>
+
+@protocol MessagesVCDelegate
+
+-(void)newMessageAdded;
+
+@end
+
+@interface MessagesVC : NSViewController
+
+-(void)setUpViewWithModel: (QAbstractItemModel*) model;
+@property (retain, nonatomic) id <MessagesVCDelegate> delegate;
+
+@end