[cbpalumbi]

Summary
ApplePlugInEnvironment.SyncronizePlayModeSupportLibraries copies each plug-in's Play Mode support library into Assets/Apple Plug-In Support/Editor/PlayModeSupport with FileUtil, which bypasses the AssetDatabase. It then calls AssetDatabase.Refresh so that Unity sees the copies. That refresh rescans every asset in the project to find a few files whose paths the method already holds.

The sync runs on every domain load. In a large project with an Apple build target active, the refresh costs several seconds each time the Editor enters Play Mode, recompiles, or opens the project.

Changes

• Each library is imported with AssetDatabase.ImportAsset by path, and the project-wide AssetDatabase.Refresh is removed.
• The deletes and imports run inside one StartAssetEditing / StopAssetEditing batch, so the Editor makes a single import pass.

Testing

• Tested in a large production Unity project with Apple.Core 3.1.8 and an iOS build target. Entering Play Mode, recompiling, and opening the project each got about 7 seconds faster, and Play Mode native calls still worked.