feat: Added repeat option to disable loop

[DenverCoder1]

Summary

Add repeat option defaulting to true.

repeat=true - current behavior, loop to beginning of animation when complete repeat=false - leave the last line frozen in place when it is completed

Fixes #180

Type of change

• [ ] Bug fix (added a non-breaking change which fixes an issue)
• [x] New feature (added a non-breaking change which adds functionality)
• [ ] Updated documentation (updated the readme, templates, or other repo files)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

• [x] Ran tests with composer test
• [x] Added or updated test cases to test new features