Add Support for Universal Apps

XPCK now supports building of Universal Windows 8.1 and Windows Phone
8.1 app in XPlatformCloudKit.Universal project.

Support for Windows 8.0 and Windows Phone 8.0 still available but will
now be deprioritized in favor of the new Universal App Project.
Documentation will be updated over the coming weeks.

PSA: Looking for testers to try out Universal App Support and help with
Documentation!

Feature Includes:
All previously included DataServices
Configurable Background Images in Windows 8.X and Windows Phone 8.X
Light / Dark theme configuration for Windows 8.X
Auto Privacy Policy for Windows 8.X
Trial Mode for Windows Phone 8.X
Parsing Phone Numbers for Windows Phone 8.X
All previously available ItemsDescriptionView / WebView Options
Live-Tile Update on SelectedItemChanged
Sharing Feature
Search Feature

Feature Changes:
Search now available in App Bar on Windows 8
App Bar collapsed in ItemsDescriptionView for Windows Phone 8.1
SemanticZoom ZoomedOutView now contains text only

Feature Adds:
Choose between Single Vertical Layout with Jumplist or Horizontal
Panorama in Windows Phone 8.1
Configure variable sized DataTemplates in
ItemsShowcaseViewItemGroupDataTemplateSelector
In-App video playback for Youtube Videos in Windows Phone 8.1
Horizontal Orientation now supported for Windows Phone 8.1 - Watch
Youtube Videos in Full Screen

Feature Removals:
Removed LockScreen ability from Windows Phone 8.1 - Not yet supported in
Windows Phone 8.1 Universal Apps

Feature Todo:
Advertising support in Universal Apps