Moves a bunch of the xml/xpath classes/interfaces and remvoes unused code of XmlHelper

src/Umbraco.Core/Xml/XPathVariable.cs

@@ -1,32 +0,0 @@
-// source: mvpxml.codeplex.com
-
-namespace Umbraco.Core.Xml
-{
-    /// <summary>
-    /// Represents a variable in an XPath query.
-    /// </summary>
-    /// <remarks>The name must be <c>foo</c> in the constructor and <c>$foo</c> in the XPath query.</remarks>
-    public class XPathVariable
-    {
-        /// <summary>
-        /// Gets or sets the name of the variable.
-        /// </summary>
-        public string Name { get; private set; }
-
-        /// <summary>
-        /// Gets or sets the value of the variable.
-        /// </summary>
-        public string Value { get; private set; }
-
-        /// <summary>
-        /// Initializes a new instance of the <see cref="XPathVariable"/> class with a name and a value.
-        /// </summary>
-        /// <param name="name"></param>
-        /// <param name="value"></param>
-        public XPathVariable(string name, string value)
-        {
-            Name = name;
-            Value = value;
-        }
-    }
-}