Merge pull request #10 from hadashiA/ku/support-unity2021

Add polyfills for unity 2021.3

Merge pull request #8 from hadashiA/ku/fix-playerloop2

Fix a bug that runner being ignored

Merge pull request #6 from hadashiA/ku/fix-playerloop

Fixed a possible leak in the handler

Merge pull request #5 from hadashiA/ku/fix-playerloop

Fix error in SynchronizationStrategy.PlayerLoop

Merge pull request #3 from hadashiA/ku/fix-signature

Make readonly array as readonly memory

Merge pull request #2 from hadashiA/ku/fix-2023-older

Fix compilation error in unity2022

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