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/Domain/Vehicles/VehicleTexture.cs

@@ -0,0 +1,97 @@
+using System.Collections.Generic;
+
+namespace StarterNG.Domain.Vehicles;
+
+/// <summary>
+/// One vehicle folder's contribution to the catalogue: the liveries it defines,
+/// the groups they belong to and any fixed sets they form.
+/// </summary>
+public sealed class VehicleEntry
+{
+    public string? Uuid { get; set; }
+    public List<VehicleGroup> Groups { get; } = new();
+    public List<VehicleTexture> Textures { get; } = new();
+    public List<VehicleSet> Sets { get; } = new();
+}
+
+/// <summary>
+/// A family of liveries sharing a thumbnail and a category letter, as declared
+/// by one textures.txt block.
+/// </summary>
+public sealed class VehicleGroup
+{
+    public string Id { get; set; } = "";
+    public string? Category { get; set; }
+    public string? Mini { get; set; }
+
+    /// <summary>Withdrawn stock, hidden from the depot unless asked for.</summary>
+    public bool Archived { get; set; }
+}
+
+/// <summary>A single livery: one skin file on one model.</summary>
+public sealed class VehicleTexture
+{
+    public string? Uuid { get; set; }
+    public string Directory { get; set; } = "";
+    public string Skinfile { get; set; } = "";
+    public string? Model { get; set; }
+    public string? Group { get; set; }
+    public string? MiniRef { get; set; }
+    public string? TextureMini { get; set; }
+
+    /// <summary>Wreck liveries exist in the files but are not offered in the depot.</summary>
+    public bool Wreck { get; set; }
+
+    public List<VehicleAlias> Aliases { get; } = new();
+    public VehicleMeta? Meta { get; set; }
+
+    public string FullPath => Directory + Skinfile;
+
+    /// <summary>Thumbnail name after group inheritance; filled by the catalogue.</summary>
+    public string ResolvedClass { get; internal set; } = "";
+
+    /// <summary>Category letter after group inheritance; filled by the catalogue.</summary>
+    public string? ResolvedCategory { get; internal set; }
+
+    /// <summary>Whether the owning group is archived; filled by the catalogue.</summary>
+    public bool ResolvedArchived { get; internal set; }
+}
+
+/// <summary>An alternative model this same skin can be worn by.</summary>
+public sealed class VehicleAlias
+{
+    public string? Model { get; set; }
+    public string? Group { get; set; }
+    public string? MiniRef { get; set; }
+    public string? TextureMini { get; set; }
+}
+
+/// <summary>
+/// The comma separated description a livery carries after "//": who made it, for
+/// which operator and depot, and when it was last revised.
+/// </summary>
+public sealed class VehicleMeta
+{
+    public string? Raw { get; set; }
+    public string? Version { get; set; }
+    public string? Vehicle { get; set; }
+    public string? Operator { get; set; }
+    public string? Depot { get; set; }
+    public string? RevisionDate { get; set; }
+    public string? RevisionPlace { get; set; }
+    public string? TextureAuthor { get; set; }
+    public string? PhotoAuthor { get; set; }
+    public List<string> Extra { get; } = new();
+}
+
+/// <summary>
+/// Vehicles that belong together and are added to a consist as a unit, such as a
+/// multiple unit or a fixed rake.
+/// </summary>
+public sealed class VehicleSet
+{
+    public string? Uuid { get; set; }
+    public string? Mode { get; set; }
+    public int Count { get; set; }
+    public List<string> TextureRefs { get; set; } = new();
+}