Add a couple of IS-CAB extensions

Author: mnadareski

SabreTools.Serialization/Wrappers/InstallShieldCabinet.cs

@@ -18,6 +18,9 @@ public partial class InstallShieldCabinet : WrapperBase<Cabinet>
 
         #region Extension Properties
 
+        /// <inheritdoc cref="Cabinet.CommonHeader"/>
+        public CommonHeader? CommonHeader => Model.CommonHeader;
+
         /// <inheritdoc cref="Cabinet.Components"/>
         public Component[]? Components => Model.Components;
 
@@ -60,6 +63,9 @@ public partial class InstallShieldCabinet : WrapperBase<Cabinet>
         /// </summary>
         public int MajorVersion => Model.GetMajorVersion();
 
+        /// <inheritdoc cref="Cabinet.VolumeHeader"/>
+        public VolumeHeader? VolumeHeader => Model.VolumeHeader;
+
         /// <summary>
         /// Reference to the next cabinet header
         /// </summary>