Holiday Bugfixes (#1762)

* Don't show "not much going on" when we are actively downloading

* Swipe to paginate is now behind a flag in the user preferences.

* Added a new server setting for host name, if the server sits behind a reverse proxy. If this is set, email link generation will use it and will not perform any checks on accessibility (thus email will always send)

* Refactored the code that checks if the server is accessible to check if host name is set, and thus return rue if so.

* Added back the system drawing library for markdown parsing.

* Fixed a validation error

* Fixed a bug where folder watching could get re-triggered when it was disabled at a server level.

* Made the manga reader loader absolute positioned for better visibility

* Indentation

API/Data/Migrations/20230129210741_SwipeToPaginatePref.cs

@@ -0,0 +1,26 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace API.Data.Migrations
+{
+    public partial class SwipeToPaginatePref : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<bool>(
+                name: "SwipeToPaginate",
+                table: "AppUserPreferences",
+                type: "INTEGER",
+                nullable: false,
+                defaultValue: false);
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "SwipeToPaginate",
+                table: "AppUserPreferences");
+        }
+    }
+}

API/Data/Migrations/DataContextModelSnapshot.cs

@@ -249,6 +249,9 @@ namespace API.Data.Migrations
                     b.Property<bool>("ShowScreenHints")
                         .HasColumnType("INTEGER");
 
+                    b.Property<bool>("SwipeToPaginate")
+                        .HasColumnType("INTEGER");
+
                     b.Property<int?>("ThemeId")
                         .HasColumnType("INTEGER");