Add ICollection, ICollection<T> and IList to KnownTypeReference.

src/Libraries/NRefactory/ICSharpCode.NRefactory/TypeSystem/KnownTypeReference.cs

@@ -101,6 +101,12 @@ namespace ICSharpCode.NRefactory.TypeSystem
 		IEnumerableOfT,
 		/// <summary><c>System.Collections.Generic.IEnumerator{T}</c></summary>
 		IEnumeratorOfT,
+		/// <summary><c>System.Collections.Generic.ICollection</c></summary>
+		ICollection,
+		/// <summary><c>System.Collections.Generic.ICollection{T}</c></summary>
+		ICollectionOfT,
+		/// <summary><c>System.Collections.Generic.IList</c></summary>
+		IList,
 		/// <summary><c>System.Collections.Generic.IList{T}</c></summary>
 		IListOfT,
 		/// <summary><c>System.Collections.Generic.IReadOnlyList{T}</c></summary>
@@ -158,7 +164,11 @@ namespace ICSharpCode.NRefactory.TypeSystem
 			new KnownTypeReference(KnownTypeCode.IEnumerator,    "System.Collections", "IEnumerator"),
 			new KnownTypeReference(KnownTypeCode.IEnumerableOfT, "System.Collections.Generic", "IEnumerable", 1),
 			new KnownTypeReference(KnownTypeCode.IEnumeratorOfT, "System.Collections.Generic", "IEnumerator", 1),
+			new KnownTypeReference(KnownTypeCode.ICollection,    "System.Collections", "ICollection"),
+			new KnownTypeReference(KnownTypeCode.ICollectionOfT, "System.Collections.Generic", "ICollection", 1),
+			new KnownTypeReference(KnownTypeCode.IList,          "System.Collections", "IList"),
 			new KnownTypeReference(KnownTypeCode.IListOfT,       "System.Collections.Generic", "IList", 1),
+
 			new KnownTypeReference(KnownTypeCode.IReadOnlyListOfT, "System.Collections.Generic", "IReadOnlyList", 1),
 			new KnownTypeReference(KnownTypeCode.Task,        "System.Threading.Tasks", "Task"),
 			new KnownTypeReference(KnownTypeCode.TaskOfT,     "System.Threading.Tasks", "Task", 1, baseType: KnownTypeCode.Task),