add simple base mvvm stuff
use ViewModelBase for MainWindowViewModel
move views to views folder
remove unused styles
introduce custom styles dictionary
only style formatting
only code behind formatting
introduce FriendControlModelView
Merge remote-tracking branch 'upstream/master' into punker76-mvvm-cleartype-etc

Solved Conflicts:
	Toxy/MainWindow.xaml
	Toxy/Toxy.csproj
introduce IChatObject
first friend implemention... not yet finished
introduce ToxyMetroListBoxItem

(todo, setting the background for non breaking cleartype must be fixed
at  mahapps...)
intermediate state
friend calling stuff
group stuff
if last online time is emty, use current time
remove old controls
one number property is enough -> ChatNumber
add SelectedChatNumber
group delete action and menu item