PDF Reader Settings, New Reading Modes, and lots of fixes (#2828)

Co-authored-by: Elry <144011449+ElryWeeb@users.noreply.github.com>
Co-authored-by: AlienHack <the4got10@windowslive.com>
Co-authored-by: William Brockhus <pickeringw@gmail.com>
Co-authored-by: Shivam Amin <xShivam.Amin@gmail.com>

API/Entities/Enums/UserPreferences/PdfBookMode.cs

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+using System.ComponentModel;
+
+namespace API.Entities.Enums.UserPreferences;
+
+public enum PdfLayoutMode
+{
+    /// <summary>
+    /// Multiple pages render stacked (normal pdf experience)
+    /// </summary>
+    [Description("Multiple")]
+    Multiple = 0,
+    // [Description("Single")]
+    // Single = 1,
+    /// <summary>
+    /// A book mode where page turns are animated and layout is side-by-side
+    /// </summary>
+    [Description("Book")]
+    Book = 2,
+    // [Description("Infinite Scroll")]
+    // InfiniteScroll = 3
+}

API/Entities/Enums/UserPreferences/PdfScrollMode.cs

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+using System.ComponentModel;
+
+namespace API.Entities.Enums.UserPreferences;
+
+/// <summary>
+/// Enum values match PdfViewer's enums
+/// </summary>
+public enum PdfScrollMode
+{
+    [Description("Vertical")]
+    Vertical = 0,
+    [Description("Horizontal")]
+    Horizontal = 1,
+    // [Description("Wrapped")]
+    // Wrapped = 2,
+    /// <summary>
+    /// Single page view (tap to pagninate)
+    /// </summary>
+    [Description("Page")]
+    Page = 3
+}

API/Entities/Enums/UserPreferences/PdfSpreadMode.cs

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+using System.ComponentModel;
+
+namespace API.Entities.Enums.UserPreferences;
+
+public enum PdfSpreadMode
+{
+    [Description("None")]
+    None = 0,
+    [Description("Odd")]
+    Odd = 1,
+    [Description("Even")]
+    Even = 2
+}

API/Entities/Enums/UserPreferences/PdfTheme.cs

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+using System.ComponentModel;
+
+namespace API.Entities.Enums.UserPreferences;
+
+public enum PdfTheme
+{
+    [Description("Dark")]
+    Dark = 0,
+    [Description("Light")]
+    Light = 1
+}