Missing angle conversions in PGFPlotsX

[ivan-boikov]

Description

Fixes #3266 (fully) #1007 (partially)
Also added heatmap transparency to see axes in figures below.

Testing code

pgfplotsx()

angles = collect(range(0, 2π, length = 6))
radius = [10, 10, 10, 14, 19, 10]
plot(angles, radius, proj = :polar, fill = (0, :orange, 0.5), lc=:orange, legend=:none, 
    title="#3266", size=(300,300))

theta = range(0,2π; length=60);
rho = range(0.1, 5; length=4);
z = rho .* theta';
heatmap(theta, rho, z, proj=:polar, c=:jet, alpha=0.8, title="#1007", size=(300,300))

Before fix

After fix

Attribution

• I am listed in .zenodo.json (see How to get acknowledged #3503)

[codecov]

Codecov Report

Patch coverage: 66.66% and project coverage change: -0.03 ⚠️

Comparison is base (fbdaa89) 90.42% compared to head (0598035) 90.40%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4703      +/-   ##
==========================================
- Coverage   90.42%   90.40%   -0.03%     
==========================================
  Files          40       40              
  Lines        8719     8721       +2     
==========================================
  Hits         7884     7884              
- Misses        835      837       +2     

Impacted Files	Coverage Δ
src/backends/pgfplotsx.jl	88.27% <66.66%> (-0.14%)	⬇️

... and 1 file with indirect coverage changes

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