Change Vis export API name: to_matplotlib, to_altair, to_vegalite

[caitlynachen]

Overview

Adjust user-facing to_matplotlib_code() Vis function to to_matplotlib() to simplify commands.

Changes

• Created private method to generate charts on plotting backend.
• Changed to_matplotlib_code() Vis function to to_matplotlib(), so users can access a simplified command
• Adjusted documentation to reflect changes
• Changed to_Altair and to_VegaLite to lowercase to_altair and to_vegalite to make naming consistent.

Example Output

[codecov]

Codecov Report

Merging #359 (2847611) into master (939799f) will decrease coverage by 0.07%.
The diff coverage is 100.00%.

❗ Current head 2847611 differs from pull request most recent head 5340b11. Consider uploading reports for the commit 5340b11 to get more accurate results

@@            Coverage Diff             @@
##           master     #359      +/-   ##
==========================================
- Coverage   84.29%   84.21%   -0.08%     
==========================================
  Files          51       51              
  Lines        3884     3884              
==========================================
- Hits         3274     3271       -3     
- Misses        610      613       +3     

Impacted Files	Coverage Δ
lux/_config/config.py	86.25% <100.00%> (ø)
lux/vis/Vis.py	75.44% <100.00%> (+0.59%)	⬆️
lux/vislib/matplotlib/MatplotlibRenderer.py	87.30% <100.00%> (ø)
lux/vislib/altair/Heatmap.py	93.10% <0.00%> (-3.45%)	⬇️
lux/vislib/altair/ScatterChart.py	93.93% <0.00%> (-3.04%)	⬇️
lux/vislib/matplotlib/Heatmap.py	96.66% <0.00%> (-1.67%)	⬇️
lux/vislib/matplotlib/ScatterChart.py	75.29% <0.00%> (-1.18%)	⬇️

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[dorisjlee]

Thanks @caitlynachen, this looks great! I made some changes to the code and docs. Could you look through my changes and test the code to make sure that my changes didn't break anything? Let's also make sure that the lux-binder tutorial is updated according to our changes to 3-export.rst in a separate PR to lux-binder.