added shutdown manager
added commands to the buttons within the dialog
added shutdown configuration
added/fixed language strings_en.xml
code cleanups
restructured some code
fixed: CheckedChange was not handled correctly and got lost when moving items or saving settings
fixed AssemblyInfo.cs
removed subtype designer from xaml and xml files
removed obsolete WeatherPlugin code
removed chatlog from source code
using new SystemStateChanges within the ShutdownMenuModel