Autogen unicodeplots and inspectdr

[t-bltg]

Required for JuliaPlots/PlotDocs.jl#246.

I'm merging this now, since it doesn't break or change anything.

[codecov]

Codecov Report

Merging #3636 (66b16dc) into master (c02dbca) will decrease coverage by 0.04%.
The diff coverage is 0.00%.

❗ Current head 66b16dc differs from pull request most recent head 2d0191c. Consider uploading reports for the commit 2d0191c to get more accurate results

@@            Coverage Diff             @@
##           master    #3636      +/-   ##
==========================================
- Coverage   63.73%   63.69%   -0.05%     
==========================================
  Files          28       28              
  Lines        6856     6856              
==========================================
- Hits         4370     4367       -3     
- Misses       2486     2489       +3     

Impacted Files	Coverage Δ
src/backends/pgfplotsx.jl	60.94% <0.00%> (ø)
src/examples.jl	61.76% <ø> (ø)
src/colorbars.jl	90.19% <0.00%> (-1.97%)	⬇️
src/recipes.jl	58.43% <0.00%> (-0.23%)	⬇️

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