Caliburn.Light 4.0.0

• Support view model life cycles where async operations are happening
• Merged IActivate and IDeactivate into IActivatable
• Removed BootstrapperBase and CaliburnApplication
• Removed conventions (NameBasedViewModelTypeResolver)
• Replaced IServiceLocator by IServiceProvider
• Introduce WPF and WinUI namespaces
• Removed UIContext
• Added IReadOnlyBindableCollection
• Removed ScreenHelper
• Removed PropertySupport
• Added INotifyPropertyChanging