Port only MVVM work and related fixes

RedBookPlayer.Models/Enums.cs

@@ -0,0 +1,49 @@
+namespace RedBookPlayer.Models
+{
+    /// <summary>
+    /// Determine how to handle data tracks
+    /// </summary>
+    public enum DataPlayback
+    {
+        /// <summary>
+        /// Skip playing all data tracks
+        /// </summary>
+        Skip = 0,
+
+        /// <summary>
+        /// Play silence for all data tracks
+        /// </summary>
+        Blank = 1,
+
+        /// <summary>
+        /// Play the data from all data tracks
+        /// </summary>
+        Play = 2,
+    }
+
+    /// <summary>
+    /// Current player state
+    /// </summary>
+    public enum PlayerState
+    {
+        /// <summary>
+        /// No disc is loaded
+        /// </summary>
+        NoDisc,
+
+        /// <summary>
+        /// Disc is loaded, playback is stopped
+        /// </summary>
+        Stopped,
+
+        /// <summary>
+        /// Disc is loaded, playback is paused
+        /// </summary>
+        Paused,
+
+        /// <summary>
+        /// Disc is loaded, playback enabled
+        /// </summary>
+        Playing,
+    }
+}