refactor loadSourceText

[codehag]

load source text has been moved into its own file

[jasonLaster]

💥

[codecov]

Codecov Report

Merging #3853 into master will increase coverage by <.01%.
The diff coverage is 92.3%.

@@            Coverage Diff             @@
##           master    #3853      +/-   ##
==========================================
+ Coverage   55.06%   55.06%   +<.01%     
==========================================
  Files         126      127       +1     
  Lines        4894     4892       -2     
  Branches     1014     1014              
==========================================
- Hits         2695     2694       -1     
+ Misses       2199     2198       -1

Impacted Files	Coverage Δ
src/actions/sources.js	79.03% <ø> (-1.26%)	⬇️
src/actions/sources/loadSourceText.js	92.3% <92.3%> (ø)
src/utils/parser/getEmptyLines.js	89.47% <0%> (-0.53%)	⬇️
src/components/Editor/Preview/Popup.js	6.15% <0%> (ø)	⬆️
src/components/SecondaryPanes/Frames/Group.js	73.52% <0%> (ø)	⬆️
src/components/SecondaryPanes/Frames/Frame.js	44.44% <0%> (ø)	⬆️
src/components/shared/Modal.js	86.66% <0%> (ø)	⬆️
src/components/SecondaryPanes/Frames/WhyPaused.js	91.3% <0%> (ø)	⬆️
src/components/Editor/CallSites.js	1.05% <0%> (ø)	⬆️
src/components/shared/ResultList.js	100% <0%> (ø)	⬆️
... and 6 more

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