Define StandardPlot add_traces and parse_data

[NicolaCourtier]

Description

Enable iterative plotting via StandardPlot by separating out the add_traces and parse-data functionality.

Issue reference

Fixes #544

Review

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.12%. Comparing base (c8b00e6) to head (ccbf3c9).
Report is 9 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #545      +/-   ##
===========================================
+ Coverage    99.08%   99.12%   +0.03%     
===========================================
  Files           52       55       +3     
  Lines         3605     3877     +272     
===========================================
+ Hits          3572     3843     +271     
- Misses          33       34       +1     

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[BradyPlanden]

Nice one, this looks good - thanks @NicolaCourtier!