[EmployeeDirectory] Update Xamarin.Forms package to 1.0.6188
[EmployeeDirectory] Change CopyIntoWorkingDirectory method on Android
[EmployeeDirectory] Change methods order according to interface
[EmployeeDirectory] Replace synchronous methods with their async version
[EmployeeDirectory] Add switch element to add/remove persons from favorites list
[EmployeeDirectory] Use async methods in UI
[EmployeeDirectory] Change content padding in xaml version of Login view