BUGFIX: Conflict with RequireJS

[hcpchris]

• Closes BUG: Conflict with Require.js in Exported HTML Versions of Jupyter Notebooks #66

Implemented brute-force split logic. If RequireJS is present in the JavaScript environment, applies RequireJS-specific syntax. If RequireJS is not present, then applies non-RequireJS syntax using async promises. Tests seem to be passing in:

• Jupyter Lab (where RequireJS is not used)
• Jupyter Notebook (where RequireJS is used)
• Static HTML saved using nbconvert (where RequireJS is used)

[codecov]

Codecov Report

Patch coverage: 42.32% and project coverage change: -0.40% ⚠️

Comparison is base (a82cc75) 89.15% compared to head (2d307d3) 88.75%.
Report is 17 commits behind head on v.1.4-rc-branch.

Additional details and impacted files

@@                 Coverage Diff                 @@
##           v.1.4-rc-branch     #112      +/-   ##
===================================================
- Coverage            89.15%   88.75%   -0.40%     
===================================================
  Files                  207      208       +1     
  Lines                29596    29838     +242     
  Branches              2243     2292      +49     
===================================================
+ Hits                 26386    26484      +98     
- Misses                2384     2502     +118     
- Partials               826      852      +26     

Files Changed	Coverage Δ
highcharts_core/headless_export.py	73.24% <ø> (ø)
highcharts_core/chart.py	50.00% <5.26%> (-4.16%)	⬇️
highcharts_core/utility_functions.py	45.39% <10.00%> (-1.78%)	⬇️
highcharts_core/ai.py	45.03% <45.03%> (ø)
...harts_core/utility_classes/javascript_functions.py	87.05% <56.66%> (-4.21%)	⬇️
highcharts_core/options/series/base.py	71.98% <65.21%> (-0.44%)	⬇️
highcharts_core/js_literal_functions.py	58.96% <66.66%> (+0.04%)	⬆️
highcharts_core/errors.py	100.00% <100.00%> (ø)

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