Added AppInfo.ProductName
Tweaked task tracking controls
Made ITaskHandler implementations more inheritance-friendly
Added TaskHandlerExtensions
Common.Gtk: Changed root namespace to "NanoByte.Common"
Fixed and updated Msg implementations for WinForms and Gtk#
- Merged VS2012 and VS2010 solution files

- Merged separate Gtk# build configurations into main build configurations
- Removed bundled Mono.Posix.dll for Windows (use version from Gtk# installation instead)
Common.Gtk: Created GuiTaskHandler