Clear static data on destory, fixes error during scene change

[Bob-Eric]

Proposed change(s)

Clear static data on destory, fixes error during scene change.

Useful links (GitHub issues, JIRA tickets, forum threads, etc.)

This fix #315.

Types of change(s)

• Bug fix
• New feature
• Code refactor
• Documentation update
• Other (please describe)

Testing and Verification

Please describe the tests that you ran to verify your changes. Please also provide instructions, ROS packages, and Unity project files as appropriate so we can reproduce the test environment.

Test Configuration:

• Unity Version: Unity 2022.3.58f1c1
• Unity machine OS + version: Windows 11
• ROS machine OS + version: WSL2 Ubuntu 22.04
• ROS–Unity communication: ROS-TCP-Endpoint

Checklist

• Ensured this PR is up-to-date with the dev branch
• Created this PR to target the dev branch
• Followed the style guidelines as described in the Contribution Guidelines
• Added tests that prove my fix is effective or that my feature works
• Updated the Changelog and described changes in the Unreleased section
• Updated the documentation as appropriate

Other comments

[unity-cla-assistant]

All committers have signed the CLA.