[maven-release-plugin] copy for tag spine-libgdx-4.2.1

[maven-release-plugin] copy for tag spine-libgdx-4.2.0

[maven-release-plugin] copy for tag spine-libgdx-4.1.0

[unity] Fixed previous bugfix, Unity defines UNITY_2020_3_OR_NEWER an…

…d UNITY_2020_3_16 but not UNITY_2020_3_16_OR_NEWER. See #2101.

Merge branch '4.0' of https://github.com/esotericsoftware/spine-runtimes

 into 4.0

[unity] Fixed compile errors introduced by removed FindSlotIndex and …

…FindBoneIndex methods. See commit dc9a6eb, see #1951.

[maven-release-plugin] copy for tag spine-libgdx-4.0.18.1

[maven-release-plugin] copy for tag 4.0.02.1

[maven-release-plugin] copy for tag spine-libgdx-3.8.99.1

[unity] Fixed ghost-movement of Ragdoll components: They did not upda…

…te the RagdollParent transform. Activate correct behaviour by disabling the inspector property `Old Ragdoll Behaviour` which was introduced to automatically be backwards-compatible. Closes #1670.