Allow intentional line breaks

[JacksonRG]

We were only adding to the current_y if there were words left on the current line of text. However any lines of text until the next timestamp show up.

This change allows users to specify line breaks in captions.

[JacksonRG]

Allow multi-line captions

[codecov[bot]]

Codecov Report

Merging #848 (c023d29) into develop (5b6d3ce) will increase coverage by 0.00%. The diff coverage is 0.00%.

@@           Coverage Diff            @@
##           develop     #848   +/-   ##
========================================
  Coverage    48.92%   48.93%           
========================================
  Files          184      184           
  Lines        15815    15814    -1     
========================================
  Hits          7738     7738           
+ Misses        8077     8076    -1     

Impacted Files	Coverage Δ
src/effects/Caption.cpp	0.36% <0.00%> (+<0.01%)	:arrow_up:

:mega: We’re building smart automated test selection to slash your CI/CD build times. Learn more

[jonoomph]

LGTM