Added CAS unit tests and new (2.0) interfaces for System.Web.Util

svn path=/trunk/mcs/; revision=49907

mcs/class/System.Web/System.Web.dll.sources

@@ -916,6 +916,8 @@ System.Web.Util/AltSerialization.cs
 System.Web.Util/DataSourceHelper.cs
 System.Web.Util/DataSourceResolver.cs
 System.Web.Util/ICalls.cs
+System.Web.Util/IWebObjectFactory.cs
+System.Web.Util/IWebPropertyAccessor.cs
 System.Web.Util/StrUtils.cs
 System.Web.Util/TimeUtil.cs
 System.Web.Util/TransactedCallback.cs

mcs/class/System.Web/System.Web_test.dll.sources

@@ -184,3 +184,5 @@ System.Web.UI.HtmlControls/HtmlTableCas.cs
 System.Web.UI.HtmlControls/HtmlTableCellCas.cs
 System.Web.UI.HtmlControls/HtmlTableRowCas.cs
 System.Web.UI.HtmlControls/HtmlTitleCas.cs
+System.Web.Util/TransactionsCas.cs
+System.Web.Util/WorkItemCas.cs