Bug fixes to the viewer_three.js previewer and improvements in the positioning of the 3D models

[cconsta1]

Description

• Fixed positioning and scaling problems of the 3D models

Review Time Estimate

• [ ] Immediately
• [ ] Within one week
• [X] When possible

Types of changes

• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ ] My change requires a change to the documentation.
• [X] I have updated the CHANGELOG.md.
• [X] I have signed the CLA
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
2 out of 3 committers have signed the CLA.

:white_check_mark: cconsta1
:white_check_mark: lmarini
:x: Chrysovalantis Constantinou

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[cconsta1]

models.zip I'm attaching three files you can use for testing the previewer. Also, I did sign the CLA in the past when I was using a different OS. Please let me know if you have any questions :)

[cconsta1]

I made additional changes which I will include in a new pull request