-Enforced reference types on Effect and XnaEffect.
-Added Flags class.
-Created UIManager
-Added UIItem.
-Added documentation to UIItem.
-Added deltatime to UIItem.
-Added IXmlLoadable to UIItem.
-Updated UIManager.
-Created IXnaDrawable.
-Used IXnaDrawable on XnaComponent.
-Used IXnaDrawable on XnaLogic.
-Used IXnaDrawable on XnaEntity.
-Support for IXnaDrawable entities.
-Fixed documentation error in IXnaDrawable.
-Added XnaUIItem.
-Added XnaUIManager.
-Made some functions virtual in UIManager.
-Fixed some logic in XnaUIManager.
-Added GlobalVariables.
-Added IComparable to UIItem.