fix issues with TranslatePrim ignoring transformations

[pilarmolinalopez]

Description (this won't be part of the changelog)

These changes solve an issue found with the TranslatePrim command that would ignore animated transforms with a single key

Changelog

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Added

Changed

• Refactor TransformationMatrix::initialiseToPrim() transform operations loop
• Set initial value for readAnimatedValues in ProxyShape::makeUsdTransformChain()

  Deprecated

Removed

Fixed

Checklist (Please do not remove this line)

• [x] Make sure the Title and Description of the PR make sense and provide sufficient context for your work
• [ ] Do any added files have the correct AL Apache Licence Header?
• [ ] Are there Doxygen comments in the headers?
• [ ] Are any new features, behaviour changes documented in the .md format documentation?
• [ ] Have you added, updated tests to cover new features and behaviour changes?
• [x] Have you filled out at least one changelog entry?
• [x] Is the branch's history clean? (only relevant commits)

[murphyeoin]

Hello @pilarmolinalopez ... @robthebloke has done a refactor of this part of the code as we discovered a number of additional bugs in addition to the one that you fixed. He did end up using some of your code, but in a more adhoc way... one consequence is that it will be almost impossible to merge this now. Do you mind if we close this one? Thanks a lot for the excellent work

[pilarmolinalopez]

Hi @murphyeoin , thanks for the update! Sounds good, you can go ahead and close it :)

[murphyeoin]

Thanks @pilarmolinalopez - expect a discussion paper soon on how to build a nicer system for syncing data between usd and maya