unity-setup@v1.2.0

[StephenHodgson]

• support installing older unity versions (Unity 4.x+ and 5.x+)
• refactor internals to use Unity Services API to get most up to date information

[Copilot]

Pull Request Overview

This PR updates the Unity setup action to version 1.2.0, adding support for older Unity versions (4.x) and refactoring the internals to use the Unity Services API for more up-to-date information. The changes modernize the version detection and installation process while maintaining backward compatibility.

• Adds support for installing Unity 4.x versions using custom installer scripts
• Refactors architecture and version handling with new UnityVersion class
• Integrates Unity Services API for improved release information retrieval

Reviewed Changes

Copilot reviewed 16 out of 24 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
src/unity-version.ts	New class for Unity version management with semver handling and ARM compatibility checks
src/unity-hub.ts	Major refactor of Unity installation logic with Unity Services API integration
src/utility.ts	Adds RemovePath function and GetCurrentPlatform utility
src/inputs.ts	Updates input validation to use UnityVersion class and improved version parsing
src/index.ts	Simplifies main logic to work with new UnityVersion objects
src/unity-editor-installer.sh	New shell script for installing Unity 4.x on macOS
src/unity-editor-installer.ps1	New PowerShell script for installing Unity 4.x on Windows
package.json	Version bump to 1.2.0 and adds Unity Releases API dependency
action.yml	Updates description to remove changeset requirement
README.md	Updates documentation for new version and output format