.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/VocaluxeWeb.csproj

@@ -1,42 +1,25 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net481</TargetFramework>
-    <LangVersion>9.0</LangVersion>
     <RootNamespace>VocaluxeWeb</RootNamespace>
     <AssemblyName>VocaluxeWeb</AssemblyName>
-    <Configurations>DebugWin;ReleaseWin;InstallerWin;DebugLinux;ReleaseLinux</Configurations>
     <Platforms>AnyCPU</Platforms>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <NoWarn>$(NoWarn);CS1591</NoWarn>
     <WebAppDir>$(MSBuildThisFileDirectory)..\WebApp\</WebAppDir>
   </PropertyGroup>
 
-  <PropertyGroup Condition="$(Configuration.StartsWith('Release')) Or $(Configuration.StartsWith('Installer'))">
-    <Optimize>true</Optimize>
-    <DebugType>pdbonly</DebugType>
-  </PropertyGroup>
-
   <ItemGroup>
-    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.3" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.AspNetCore.Hosting" Version="2.3.13" />
-    <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel" Version="2.3.13" />
-    <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel.Https" Version="2.3.13" />
-    <PackageReference Include="Microsoft.AspNetCore.Mvc.Core" Version="2.3.13" />
-    <PackageReference Include="Microsoft.AspNetCore.Mvc.ApiExplorer" Version="2.3.13" />
-    <PackageReference Include="Microsoft.AspNetCore.Mvc.DataAnnotations" Version="2.3.13" />
-    <PackageReference Include="Microsoft.AspNetCore.Mvc.Formatters.Json" Version="2.3.13" />
-    <PackageReference Include="Microsoft.AspNetCore.StaticFiles" Version="2.3.13" />
-    <PackageReference Include="Microsoft.AspNetCore.ResponseCompression" Version="2.3.13" />
-    <!-- ASP.NET Core 2.3 pulls Newtonsoft.Json 11.0.2 (known vulnerability); use the version Vocaluxe uses -->
-    <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
-    <PackageReference Include="Swashbuckle.AspNetCore.SwaggerGen" Version="6.9.0" />
-    <PackageReference Include="Swashbuckle.AspNetCore.SwaggerUI" Version="6.9.0" />
-    <PackageReference Include="Swashbuckle.AspNetCore.Newtonsoft" Version="6.9.0" />
+    <FrameworkReference Include="Microsoft.AspNetCore.App" />
   </ItemGroup>
 
   <ItemGroup>
-    <Reference Include="System.Drawing" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="10.0.14" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
+    <PackageReference Include="SkiaSharp" Version="4.154.0" />
+    <PackageReference Include="Swashbuckle.AspNetCore.SwaggerGen" Version="10.3.1" />
+    <PackageReference Include="Swashbuckle.AspNetCore.SwaggerUI" Version="10.3.1" />
+    <PackageReference Include="Swashbuckle.AspNetCore.Newtonsoft" Version="10.3.1" />
   </ItemGroup>
 
   <!-- The WebApp (Vue/TypeScript) is built with Node.js as part of this project.