Move rolling stock and physics into the domain

VehicleDatabase becomes VehicleCatalog, Physics becomes VehiclePhysics, and the
textures.txt and .fiz parsers move to Infrastructure. GameLibrary replaces the
GameData singleton.

StarterNG.Tests/GameLibraryTests.cs

@@ -0,0 +1,75 @@
+using StarterNG.Application;
+using StarterNG.Tests.Fakes;
+
+namespace StarterNG.Tests;
+
+public class GameLibraryTests
+{
+    private static TestInstallation Complete() =>
+        new(new InMemoryFileSystem()
+            .WithFile(TestInstallation.At("dynamic", "pkp", "ep07", "textures.txt"), "ep07-135.mat=ep07.e3d,ep07")
+            .WithFile(TestInstallation.At("scenery", "kato.scn"), "//$n Katowice")
+            .WithFile(TestInstallation.At("textures", "mini", "ep07.bmp"), "bitmap"));
+
+    [Fact]
+    public void Loading_reads_both_the_rolling_stock_and_the_scenarios()
+    {
+        var library = Complete().Library;
+
+        library.Load();
+
+        Assert.True(library.Loaded);
+        Assert.Single(library.Vehicles.Textures);
+        Assert.Equal("Katowice", Assert.Single(library.Sceneries).Name);
+    }
+
+    [Fact]
+    public void Loading_reports_progress_through_to_done()
+    {
+        var phases = new List<LoadPhase>();
+        var progress = new Progress<LoadStatus>(status => { lock (phases) phases.Add(status.Phase); });
+
+        Complete().Library.Load(progress);
+
+        SpinWait.SpinUntil(() => { lock (phases) return phases.Contains(LoadPhase.Done); }, TimeSpan.FromSeconds(2));
+        lock (phases)
+        {
+            Assert.Contains(LoadPhase.Vehicles, phases);
+            Assert.Contains(LoadPhase.Done, phases);
+        }
+    }
+
+    [Fact]
+    public void Loading_twice_does_not_duplicate_the_scenarios()
+    {
+        var library = Complete().Library;
+
+        library.Load();
+        library.Load();
+
+        Assert.Single(library.Sceneries);
+    }
+
+    [Fact]
+    public void Reloading_picks_up_a_scenery_added_after_startup()
+    {
+        var installation = Complete();
+        var library = installation.Library;
+        library.Load();
+
+        installation.Files.WithFile(TestInstallation.At("scenery", "gdansk.scn"), "//$n Gdańsk");
+        library.ReloadSceneries();
+
+        Assert.Equal(2, library.Sceneries.Count);
+    }
+
+    [Fact]
+    public void An_installation_with_no_rolling_stock_is_logged()
+    {
+        var installation = new TestInstallation();
+
+        installation.Library.Load();
+
+        Assert.Contains("textures.txt", installation.Log.Text);
+    }
+}