[ENH] Reimplement macOS application (.app) build scripts

[ales-erjavec]

Issue

Update macOS application to use a newer Python (3.6) and Qt (5.8)

Description of changes

Replace the old build scripts. There is no prebuild bundle template anymore. The python framework is downloaded/extracted from the official python.org macOS pkg installers, laid out into the .app directory and made relocatable (using install_name_tool to change .dylib' library load paths relative).

All other dependencies are then installed using pip/wheel

However with Python 3.6 we are now responsible for distributing a ssl certificate store.

Includes

• Code changes
• Tests
• Documentation

[codecov-io]

Codecov Report

Merging #2217 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2217   +/-   ##
=======================================
  Coverage   72.17%   72.17%           
=======================================
  Files         318      318           
  Lines       54765    54765           
=======================================
  Hits        39526    39526           
  Misses      15239    15239

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[astaric]

When I build an app using this script and run it, Orange menu lists

• About main.py
• Hide main.py

Would it be possible to rename those entries?

[ales-erjavec]

Would it be possible to rename those entries?

Should be fixed now.

[astaric]

Looks ok to me. Can I merge it or will it break the daily builds?

[janezd]

I have one more question: can we decrease the bundle size? A year or two ago I noticed that we distribute a lot of stuff, perhaps even QtDesigner, in the bundle.

[ales-erjavec]

Can I merge it or will it break the daily builds?

The daily builds are already broken, so this cannot hurt much.

can we decrease the bundle size?

I do not think so. This one is about 20MB lighter than before (122MB).