feat(glb): a loader for binary glTF, and images decoded from memory

- Crafter.Asset:GLB. GlbAsset::Load reads a .glb from a file or a buffer:
  - nodes, with their parents;
  - every mesh's primitives: positions, normals, UV0, tangents (computed
    when absent), joints, weights (normalized), u32 indices;
  - skins with their inverse-bind matrices;
  - materials: PBR, emissive strength, transmission, ior, alpha mode;
  - images decoded to RGBA8, and samplers;
  - cameras and KHR_lights_punctual lights;
  - the raw JSON, and the extras of the scene, nodes, materials and lights.
  nlohmann/json 3.12.0 is vendored in lib/; only the implementation sees it.
- A broken file comes back as an error rather than a crash:
  - bad magic, truncation, a sparse accessor;
  - a chunk, view or accessor past its bounds, checked so that nothing
    wraps round, with 32-bit size_t too;
  - a stride outside 4..252, or one its elements overlap in;
  - a reference to something that doesn't exist, or children that form a
    cycle (found stepping through each node once, however deep);
  - a path that isn't a file;
  - an image larger than a texture's 65535 a side.
- TextureAsset::LoadPNGFromMemory decodes an image already in memory.
  LoadPNG refuses images over 65535 a side instead of truncating their size
  (in its float path, past the end of the pixels).
- Tests: GLB.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

project.cpp

@@ -72,24 +72,32 @@ extern "C" Configuration CrafterBuildProject(std::span<const std::string_view> a
     }
     for (const fs::path& p : libdeflateSources) cfg.cFiles.push_back(p);
 
-    std::array<fs::path, 4> ifaces = {
+    std::array<fs::path, 5> ifaces = {
         "interfaces/Crafter.Asset",
         "interfaces/Crafter.Asset-Compression",
         "interfaces/Crafter.Asset-Texture",
         "interfaces/Crafter.Asset-Mesh",
+        "interfaces/Crafter.Asset-GLB",
     };
     if (cfg.type == ConfigurationType::Executable) {
-        std::array<fs::path, 2> impls = {
+        std::array<fs::path, 3> impls = {
             "implementations/Crafter.Asset-Compression",
+            "implementations/Crafter.Asset-GLB",
             "implementations/main",
         };
         cfg.GetInterfacesAndImplementations(ifaces, impls);
     } else {
-        std::array<fs::path, 1> impls = {
+        std::array<fs::path, 2> impls = {
             "implementations/Crafter.Asset-Compression",
+            "implementations/Crafter.Asset-GLB",
         };
         cfg.GetInterfacesAndImplementations(ifaces, impls);
     }
 
+    // Tests link this project's static library. wasm builds run no tests.
+    if (!isWasm && cfg.type == ConfigurationType::LibraryStatic) {
+        cfg.AddTest("GLB").Dependencies({ &cfg });
+    }
+
     return cfg;
 }