Add Pacman's chomping animation

[nucleartide]

User Story

Give Pacman a chomping animation:

Playable build

None for this PR, please see subsequent PRs for builds.

Dev checklist

• First draft. Implement a working first pass at the feature. If it helps, try thinking about data (model), presentation (view), and logic (controller).
  • Design by contract. Write pre-condition, post-condition, and invariant assertions to catch bugs before playtesting.
  • Unit tests. If needed, write unit tests to tease out edge cases.
  • First playtest. Thoroughly playtest until you are confident that the feature (and existing features) work. This also exercises the code paths with contracts.
• Final draft. Perform a general review of Files changed and revise anything that needs to be cleaned up.
  • Run unit tests.
  • Final playtest. After the changes above, playtest through the game one last time to ensure that everything works.
• Fill out the pull request template. Self-explanatory.
• Remember the GIFs. Include a recording of what's going on!
• Update readme. Maintain a list of pull requests for easy access later.
• Merge. Merge into master.
• Deliverable. Push update to portfolio

Release checklist

• Build. Cut a new build in Unreal. If the game doesn't build, fix until it does.
• Tag. Once built, tag the latest commit on master with the latest version string.
• Upload. Upload build to Google Drive.
• Link. Add link to this pull request.
• Retro. Quick reflection on how things could have gone better.
• Priorities. Prioritize items on work board.
• Next task. Tee up a pull request for the next feature.
• Get portfolio feedback