[ENH] macOS: Installer python version

[ales-erjavec]

Issue

Add support for 3.7 and 3.8 python in the macOS application bundle.

Description of changes

Extend installer build scripts

• Add support for 10.9 target macOS target version, (also allow pre-release versions for testing)
• Use Python 3.7.5 (macOs 10.9 target) by default.

Includes

• Code changes
• Tests
• Documentation

[codecov]

Codecov Report

Merging #4130 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4130      +/-   ##
==========================================
- Coverage   85.68%   85.67%   -0.01%     
==========================================
  Files         390      390              
  Lines       69732    69732              
==========================================
- Hits        59750    59746       -4     
- Misses       9982     9986       +4

[astaric]

Tried to test this. When I run

./build-macos-app.sh ~/tmp/orange3-test

on Catalina, I get

curl: (22) The requested URL returned error: 404 
tar: Python_Framework.pkg/Payload: Not found in archive
tar: Error exit delayed from previous errors.
Single version framework expected (found: )
./python-framework.sh: line 298: cd: /Users/anze/tmp/orange3-test/Contents/Frameworks/Python.framework/Versions: No such file or directory
./python-framework.sh: line 300: no match: ?.?
./python-framework.sh: line 250: /Users/anze/tmp/orange3-test/Contents/Frameworks/Python.framework/Versions/Current/bin/python?.?: No such file or directory
./python-framework.sh: line 251: /Users/anze/tmp/orange3-test/Contents/Frameworks/Python.framework/Versions/Current/bin/python?.?: No such file or directory

[astaric]

Error changed to

tar: Error opening archive: Unrecognized archive format
Single version framework expected (found: )
./python-framework.sh: line 302: no match: ?.?
./python-framework.sh: line 252: /Users/anze/tmp/orange3-test/Contents/Frameworks/Python.framework/Versions/Current/bin/python?.?: No such file or directory
./python-framework.sh: line 253: /Users/anze/tmp/orange3-test/Contents/Frameworks/Python.framework/Versions/Current/bin/python?.?: No such file or directory

I get the same error if I run tar -xf /Users/anze/.cache/pkgs/python-3.7.5-macosx10.9.pkg
The archive seems ok, since I can run xar -xf /Users/anze/.cache/pkgs/python-3.7.5-macosx10.9.pk just fine.

Edit: Tried on a clean install of Catalina to rule out OS problems, same error.

[astaric]

Python installation now works, but installer building still errors with

  ERROR: Could not find a version that satisfies the requirement sip==4.19.3 (from -r ./requirements.txt (line 19)) (from versions: 4.19.7, 4.19.8, 5.0.0)
ERROR: No matching distribution found for sip==4.19.3 (from -r ./requirements.txt (line 19))

(sip 4.19.3 has not been built for python 3.7)