revisiting interactivity: bug fixes and quality of life improvements

[Sid-Bhatia-0]

1. Fix type signature of frame_rate in replay method
2. Add default value for frame_start_delimiter
3. Prevent accidental overwrite of recording file
4. Print frame number during replay

[codecov[bot]]

Codecov Report

Merging #187 (85620a6) into master (6c62515) will decrease coverage by 0.30%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #187      +/-   ##
==========================================
- Coverage   62.08%   61.78%   -0.30%     
==========================================
  Files          27       28       +1     
  Lines        2624     2685      +61     
==========================================
+ Hits         1629     1659      +30     
- Misses        995     1026      +31     

Impacted Files	Coverage Δ
src/play.jl	0.00% <0.00%> (ø)

... and 14 files with indirect coverage changes

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