Radial progress in settings when loading a new background from gallery.

MediaView handling of screen resolution change fixed.
Media messages now display both name/type and caption in dialogs list.
When viewing group profile photo delete affects either photo or message.

Telegram/SourceFiles/mainwidget.h

@@ -345,6 +345,7 @@ public:
 
 	void setChatBackground(const App::WallPaper &wp);
 	bool chatBackgroundLoading();
+	float64 chatBackgroundProgress() const;
 	void checkChatBackground();
 	ImagePtr newBackgroundThumb();