Replace Magick.NET with stb_image; refactor asset pipeline

- Switched image loading/saving from Magick.NET to native stb_image (Ghost.StbI), removing Magick.NET dependency.
- Added Ghost.StbI project with native DLL, P/Invoke bindings, and wrapper.
- Refactored TextureAssetHandler and TextureProcessor for stb_image, memory-mapped IO, and HDR/16-bit support.
- Split IAssetHandler into IImportableAssetHandler and IPackableAssetHandler; updated interfaces to use FileStream.
- Added shader and mesh asset handlers (GraphicsShaderAssetHandler, ComputeShaderAssetHandler, FBXAssetHandler).
- Improved asset registry/catalog path handling and naming consistency.
- Updated asset import pipeline to use new interfaces and trigger engine reimport.
- Enhanced UI toolbar button styles and EditPage layout.
- Added StbIBindingTest, DisableRuntimeMarshalling, and native wrapper attributes.
- Updated wrapper generator for regex derivesFrom; added stbi.json config.
- Removed Magick.NET reference; added Ghost.StbI and Ghost.Ufbx references.
- Miscellaneous bugfixes and code cleanup.

src/Editor/Ghost.DSL/ShaderParser/AntlrShaderCompiler.cs

@@ -7,10 +7,8 @@ namespace Ghost.DSL.ShaderParser;
 
 public class AntlrShaderCompiler
 {
-    public static List<GraphicsShaderModel> ParseShaders(string source, out List<DSLShaderError> errors)
+    public static List<GraphicsShaderModel> ParseShaders(string source, List<DSLShaderError> errors)
     {
-        errors = new List<DSLShaderError>();
-
         try
         {
             var inputStream = new AntlrInputStream(source);
@@ -53,7 +51,7 @@ public class AntlrShaderCompiler
         }
     }
 
-    public static List<ComputeShaderModel> ParseComputeShaders(string source, out List<DSLShaderError> errors)
+    public static List<ComputeShaderModel> ParseComputeShaders(string source, List<DSLShaderError> errors)
     {
         errors = new List<DSLShaderError>();