Support for Timeline override tracks

[pkirsten]

Describe the bug 💬

I use a lot of prerecorded animations in which I adjust some offsets with a few keyframes in timeline override tracks.

When I export the timeline, all adjustments of the override tracks are missing.

I expected that the override tracks to be applied during export.

https://user-images.githubusercontent.com/38910969/225969154-032d4837-406a-419c-a7b5-7ccad2f3fe58.mp4

https://user-images.githubusercontent.com/38910969/225969161-b3d0d891-1187-4786-843d-d1cf147acf77.mp4

Override of rotation animation is missing in that minimal example.

Operating System 👩‍💻

Windows

What browsers are you seeing the problem on? 🏄‍♂️

Chrome

Editor Version 🎲

2021.3

Needle Exporter version

2.66.0-pre.1

Project Info (Unity only) 📜

No response

Steps to reproduce 🔢

1.Create a timeline track with animation clip.
2.Add an override track and modify animation.
3.Export with needle.

I have prepared a minimal testscene.

Reproduction ♻

timelineoverride.zip

Validations 🩹

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• [X] Read the docs.
• [X] Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• [X] Make sure this is a Needle-Engine-specific issue. For example if it's a Unity related bug, it should be reported to Unity instead.
• [X] Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• [X] The provided reproduction is a minimal reproducible example of the bug.