include object's own frame

[Licini]

@tomvanmele I know we had some discussion on moving responsibility of handling transformation out of Scene. But before we actually do that, there was a mistake here to fix. The worldtransformation was not including the object's own frame. This PR is to fix that.

What type of change is this?

• [x] Bug fix in a backwards-compatible manner.
• [ ] New feature in a backwards-compatible manner.
• [ ] Breaking change: bug fix or new feature that involve incompatible API changes.
• [ ] Other (e.g. doc update, configuration, etc)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• [x] I added a line to the CHANGELOG.md file in the Unreleased section under the most fitting heading (e.g. Added, Changed, Removed).
• [x] I ran all tests on my computer and it's all green (i.e. invoke test).
• [x] I ran lint on my computer and there are no errors (i.e. invoke lint).
• [ ] I added new functions/classes and made them available on a second-level import, e.g. compas.datastructures.Mesh.
• [x] I have added tests that prove my fix is effective or that my feature works.
• [x] I have added necessary documentation (if appropriate)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 59.99%. Comparing base (ea316f9) to head (49130dd).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1379 +/- ## ========================================== + Coverage 59.92% 59.99% +0.07% ========================================== Files 206 206 Lines 22136 22136 ========================================== + Hits 13264 13280 +16 + Misses 8872 8856 -16 ```

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[Licini]

LGTM. although would be nice if there were an example in the docs :)

Just updated the relevant section in the docs. Also added a test. btw what should I do to pass this codecov test??