Update to support ARM64 build target

[jamescharters]

Fixes: [issue-number]

Summary: [summary of the change and which issue is fixed here]

This change introduces full ARM64 support for CefSharp, covering native C++/CLI projects, managed .NET Framework projects, NuGet packaging, and the build pipeline. It enables CefSharp to be built and distributed for Windows ARM64 devices natively.

Changes: [specify the structures changed]

• Added ArchitectureHelper.cs — new helper class that resolves the current process architecture (x86/x64/arm64) for both .NET Framework and .NET Core
• Modified CefRuntime.cs — replaced Environment.Is64BitProcess checks with ArchitectureHelper.ProcessArchitecture so ARM64 processes resolve the correct arch-specific assembly path
• Modified DependencyChecker.cs — skips d3dcompiler_47.dll in optional dependency checks when running on ARM64 (not available on that platform)
• Modified CefSharp.Core.Runtime.vcxproj and CefSharp.BrowserSubprocess.Core.vcxproj — added Debug|arm64 and Release|arm64 project configurations
• Modified CefSharp.BrowserSubprocess.csproj — added arm64 platform/runtime identifier and updated the post-build editbin/sn script to select the correct vcvarsall arch for x86, x64, and arm64 (including cross-compile from AMD64 host)
• Modified CefSharp3.sln — registered Debug|arm64 and Release|arm64 solution-level configurations for all projects
• Modified CefSharp.Native.props — added arm64 locale content item group
• Modified example and test projects (OffScreen, WinForms, WPF, HwndHost, Test) — added arm64 to , , and conditional / properties
• Modified CefSharp.Common.nuspec — added chromiumembeddedframework.runtime.win-arm64 dependency and arm64 binary entries
• Modified CefSharp.Common.props — added CefSharpCommonBinariesArm64 and CefSharpBrowserProcessCoreArm64 item groups
• Modified CefSharp.Common.targets — added arm64 / item groups and CefSharpCopyFilesAfterNugetRestoreArm64 copy target
• Modified build.ps1 — refactored BuildSolution to invoke msbuild.exe directly; added Get-HostArchitecture, Get-VCVarsAllArch, and Ensure-BuildEnvironment helpers to correctly bootstrap the VC environment per target arch (native or cross-compile); removed the blanket arm64 exclusion for NetFramework builds and replaced it with a guard that requires VS2022/v143 when targeting arm64

How Has This Been Tested?

Built the solution targeting ARM64 using build.ps1 with -BuildArches arm64 -Target vs2022 on an AMD64 host (cross-compile). Verified arm64 binaries are produced in bin\arm64\Release for both CefSharp.Core.Runtime and CefSharp.BrowserSubprocess.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Updated documentation

Checklist:

• Tested the code(if applicable)
• Commented my code
• Changed the documentation(if applicable)
• New files have a license disclaimer
• The formatting is consistent with the project (project supports .editorconfig)

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[AppVeyorBot]

❌ Build CefSharp 147.0.100-CI5487 failed (commit 14883d302f by @jamescharters)

[AppVeyorBot]

❌ Build CefSharp 147.0.100-CI5488 failed (commit da5271272b by @)