Release 4.3

[edyoung]

Seems like it is about time for a 4.3 release.

The only thing I think is currently blocking is needing clearer instructions for how to install in a way that puts all the files in the right places. Please mention anything else you think should go in first.

Changelog:

• Minimum Python version now 3.6
• Supports .ASE gradient files
• Improved manual
• MacOS improvements
• improved icons
• much cleanup of python and C++ code
• better testing infra via GitHub Actions
• removed fractutils folder
• improve install instructions

[codecov-commenter]

Codecov Report

Merging #149 into master will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #149      +/-   ##
==========================================
+ Coverage   79.73%   79.76%   +0.02%     
==========================================
  Files          55       55              
  Lines       10920    10920              
==========================================
+ Hits         8707     8710       +3     
+ Misses       2213     2210       -3     

Impacted Files	Coverage Δ
fract4d/options.py	91.35% <100.00%> (ø)
fract4d/fractal.py	90.57% <0.00%> (-0.15%)	⬇️
fract4d/gradient.py	90.94% <0.00%> (+0.72%)	⬆️

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[edyoung]

@mindhells if you think the undefined behavior fixes are nearly ready I would like to wait for those. Otherwise I think we can release.

[mindhells]

@mindhells if you think the undefined behavior fixes are nearly ready I would like to wait for those. Otherwise I think we can release.

I left a comment in #154. I think it's ok to merge but I will continue researching about the GIL, GTK and ref counting playing together.