Added application setting objects.

Harmonia.WinUI/Session/ApplicationSession.cs

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+namespace Harmonia.WinUI.Session;
+
+public partial class ApplicationSession
+{
+    public WindowSession Window { get; set; } = new();
+    public NavigationSession Navigation { get; set; } = new();
+    public AudioLibrarySession Library { get; set; } = new();
+    public AudioPlayerSession Player { get; set; } = new();
+    public PlaylistSession Playlist { get; set; } = new();
+}

Harmonia.WinUI/Session/AudioLibrarySession.cs

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+namespace Harmonia.WinUI.Session;
+
+public partial class AudioLibrarySession
+{
+    public string? FlexViewType { get; set; }
+    public string? LibraryViewType { get; set; }
+    public string? Breadcrumbs { get; set; }
+}

Harmonia.WinUI/Session/AudioPlayerSession.cs

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+namespace Harmonia.WinUI.Session;
+
+public partial class AudioPlayerSession
+{
+    public string? PlaylistUID { get; set; }
+    public string? PlaylistSongUID { get; set; }
+    public double Position { get; set; } = 0.0;
+    public string? PlaybackState { get; set; }
+    public double Volume { get; set; } = 1.0;
+    public bool IsMuted { get; set; }
+    public string? RepeatState { get; set; }
+    public bool IsRandom { get; set; }
+}

Harmonia.WinUI/Session/NavigationSession.cs

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+namespace Harmonia.WinUI.Session;
+
+public partial class NavigationSession
+{
+    public string? CurrentPage { get; set; }
+}

Harmonia.WinUI/Session/PlaylistSession.cs

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+namespace Harmonia.WinUI.Session;
+
+public partial class PlaylistSession
+{
+    public string? OpenPlaylistUID { get; set; }
+}

Harmonia.WinUI/Session/WindowSession.cs

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+namespace Harmonia.WinUI.Session;
+
+public partial class WindowSession
+{
+    public bool IsMaximized { get; set; }
+}