Improved WPF with messages and exception handling, some refactoring
refactoring
Merge branch 'master' of https://github.com/kalinalazarova1/DatabaseTeamProject

Conflicts:
	VehicleVendorConsole.Client/VehicleVendorConsole.Client.csproj
	VehicleVendorConsole.Client/VehicleVendorConsoleClientEntryPoint.cs
	VehicleVendorConsole.Client/XmlLoader.cs