Added creating XML documentation file when build
[UBER-1707] Added context menu to SetTextButton in WpfTestApplication.
[UBER-1707] Added new element ContextMenu (with tests).
[UBER-1708] Added use OpenFile and SaveFile dialogs in WpfTestApplication.
[UBER-1708] Added new class (Cruciatus.OpenFileDialog) for work with Microsoft.Win32.OpenFileDialog (with tests).
[UBER-1708] Added new class (Cruciatus.SaveFileDialog) for work with Microsoft.Win32.SaveFileDialog (with tests). Up version.
[UBER-1709] Fixed click on disabled menu item.