Add macOS support

[tattn]

• Introduced macOS support in the VRMKit package by updating the platforms in Package.swift.
• Created new asset files for AccentColor and AppIcon in the MacExample project.
• Implemented ContentView and MacExampleApp for the macOS application.
• Updated the ContentViewModel to handle VRM entity loading and animation.
• Refactored image handling to support both UIKit and AppKit with VRMImage and VRMColor types.
• Enhanced VRMEntityLoader and related classes to accommodate macOS compatibility.
• Updated README to reflect new requirements and platform support.
• Added tests to ensure compatibility with the new macOS implementation.

[gemini-code-assist]

Summary of Changes

Hello @tattn, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly extends the VRMKit's reach by introducing comprehensive support for macOS. The core objective was to enable VRM model rendering and interaction on desktop Apple platforms, aligning the project with a broader ecosystem. This involved not only updating package configurations but also refactoring platform-specific UI components into generic typealiases and creating a dedicated macOS example application to showcase the new capabilities. The changes ensure that the VRMKit remains a versatile tool for 3D model integration across Apple's diverse range of devices.

Highlights

• macOS Platform Support: The VRMKit package now officially supports macOS 12.0+, expanding its compatibility beyond iOS, watchOS, and visionOS. This involved updating the Package.swift manifest and various build configurations within the Xcode project.
• Cross-Platform Image and Color Handling: Introduced VRMImage and VRMColor typealiases to abstract UIImage/UIColor (UIKit) and NSImage/NSColor (AppKit), enabling seamless image and color management across different Apple platforms, particularly for macOS integration.
• New MacExample Application: A new example application, MacExample, has been added to demonstrate VRM model loading and animation on macOS using SwiftUI and RealityKit. This includes a ContentView and ContentViewModel to manage the VRM entity's lifecycle and interactive animations.
• VRM Entity Loader Enhancements: The VRMEntityLoader and related classes in VRMRealityKit and VRMSceneKit have been updated to ensure full compatibility with macOS, including changes to @available attributes and internal image/color processing logic.
• Documentation and Requirements Update: The README.md file has been updated to reflect the new macOS support and the increased Swift version requirement to 6.0+.
• Xcode Project Configuration: The project.pbxproj file has undergone significant modifications to incorporate the new MacExample target, its build phases, file references, and specific macOS build settings, including code signing and sandbox entitlements.

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Ignored Files

• Ignored by pattern: .github/workflows/** (1)
  • .github/workflows/ci.yml

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[gemini-code-assist]

Code Review

This pull request successfully introduces macOS support by updating package platforms, Xcode project configurations, and adapting image and color handling for cross-platform compatibility. The changes are well-structured and address the necessary platform-specific differences.