# Description

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Currently, InteractiveScene declares several of its entities
(articulation, sensor, and rigid bodies) as class variables. This causes
the variables to be shared across **all** instances of the class, which
is not desired behavior if there is ever a case when `InteractiveScene`
is used more than once.

This fix changes the following: 

1. All class variables in `InteractiveScene` defined above the
constructor is now moved inside the constructor as instance variables.
2. Adds `@property` getters to access the entities. 
3. Rolls back the fix introduced in #380, which changes the `__del__`
magic method to clear out the class variables that persisted, but ended
up breaking #464.

Fixes #465 

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## Type of change

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- Bug fix (non-breaking change which fixes an issue)

## Checklist

- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./orbit.sh --format`
- [x] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] I have run all the tests with `./orbit.sh --test` and they pass
- [x] I have updated the changelog and the corresponding version in the
extension's `config/extension.toml` file
- [x] I have added my name to the `CONTRIBUTORS.md` or my name already
exists there

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