.NET10 Migration (#946)

Runtime and build
- Move all projects to .NET 10 with SDK-style project files and a shared
  Directory.Build.props (WIN/LINUX, x86/x64 defines)
- Load managed and unmanaged dependencies from libs/managed and
  libs/unmanaged through assembly and native library resolvers
- Compile party modes with Roslyn instead of CodeDom
- Update AppVeyor to the .NET 10 SDK and dotnet test
- Download the FFmpeg and gstreamer runtimes from the dependencies
  repository during the build
- Remove the VC++ 2015-2022 runtime check, no dependency needs it anymore

Graphics and windowing
- Replace the Direct3D 9 renderer with Direct3D 11 (Vortice)
- Pace Direct3D 11 frames with a frame latency waitable swap chain
- Move window, input and message boxes to SDL3
- Replace System.Drawing with SkiaSharp and WinForms with SDL3 and a
  software renderer

Video and audio
- Replace Acinerella with FFmpeg 8.1.3 (FFmpeg.AutoGen)
- Add hardware accelerated video decoding (D3D11VA, DXVA2, VideoToolbox,
  VAAPI, VDPAU) with software fallback
- Convert YUV video frames to RGB on the GPU in Direct3D 11 and OpenGL
- Add the video options HardwareDecoding, GpuColorConversion,
  DecoderThreads and VideoDownscaleResolution
- Update OpenAL to OpenTK 4 and NAudio recording to WasapiRecorder

Fixes
- Fix the song preview start and shorten the reporter buttons
- Fix a crash when opening the highscore without a selected song
- Use the options slide highlight in the party mode screens to avoid
  brightness flicker on VRR displays
- Disable GameInput in the x86 build, SDL3 crashes in GameInputCreate
  on 32-bit systems with the GameInput runtime installed
- Fix a truncation warning in PitchTracker

VocaluxeWeb/Hosting/CStartup.cs

@@ -20,12 +20,11 @@ using System.IO;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Http;
-using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.ResponseCompression;
 using Microsoft.AspNetCore.StaticFiles;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.FileProviders;
-using Microsoft.OpenApi.Models;
+using Microsoft.OpenApi;
 using Newtonsoft.Json.Converters;
 using VocaluxeWeb.Api;
 using VocaluxeWeb.Dispatching;
@@ -58,13 +57,12 @@ namespace VocaluxeWeb.Hosting
                 compression.Providers.Add<GzipCompressionProvider>();
             });
 
-            // The entry assembly is Vocaluxe.exe, so MVC would not find our controllers on its own
+            // The entry assembly is Vocaluxe, so MVC would not find our controllers on its own
             services.AddMvcCore(mvc => mvc.Filters.Add(new CExceptionFilter(options.OnError)))
                 .AddApplicationPart(typeof(CStartup).Assembly)
                 .AddApiExplorer()
                 .AddDataAnnotations()
-                .AddJsonFormatters(json => json.Converters.Add(new StringEnumConverter()))
-                .SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
+                .AddNewtonsoftJson(json => json.SerializerSettings.Converters.Add(new StringEnumConverter()));
 
             services.AddSwaggerGen(swagger =>
             {
@@ -89,7 +87,8 @@ namespace VocaluxeWeb.Hosting
             app.UseSwagger();
             app.UseSwaggerUI(ui => ui.SwaggerEndpoint("/swagger/v1/swagger.json", "Vocaluxe API v1"));
 
-            app.UseMvc();
+            app.UseRouting();
+            app.UseEndpoints(endpoints => endpoints.MapControllers());
 
             if (!string.IsNullOrEmpty(options.WebRoot) && Directory.Exists(options.WebRoot))
             {