Add update functions to TrajectoryData

[ascibisz]

…ing a new object

Problem

What is the problem this work solves, including Link to story or ticket

Solution

What I/we did to solve this problem

with @pairperson1

Type of change

Please delete options that are not relevant.

• 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 not work as expected)
• This change requires a documentation update
• This change requires updated or new tests

Change summary:

• Tidy, well formulated commit message
• Another great commit message
• Something else I/we did

Steps to Verify:

1. A setup step / beginning state
2. What to do next
3. Any other instructions
4. Expected behavior
5. Suggestions for testing

Screenshots (optional):

Show-n-tell images/animations here

Keyfiles (delete if not relevant):

1. main file/entry point
2. other important file

Thanks for contributing!