feat(osx): deprecate platform

[brodybits]

Status

• pending formal vote

Platforms affected

"osx" (macOS)

Motivation and Context

see this discussion in dev@cordova.apache.org

Description

set "deprecated": true for "osx" in src/platforms/platformsConfig.json

Testing

updated:

In a local checkout of cordova-cli:

npm i github:apache/cordova-lib#brodybits-deprecate-osx
./bin/cordova create test2
cd test2

Output of ../bin/cordova platform ls with no deprecated platforms:

Warning: using prerelease version 10.0.1-dev (cordova-lib@10.0.1-dev)
Installed platforms:
  
Available platforms: 
  android ^9.0.0
  browser ^6.0.0
  electron ^1.0.0
  ios ^6.1.0
  osx ^6.0.0 (deprecated)

Output of ../bin/cordova platform ls with "osx" platform added:

Warning: using prerelease version 10.0.1-dev (cordova-lib@10.0.1-dev)
Installed platforms:
  osx 6.0.0 (deprecated)
Available platforms: 
  android ^9.0.0
  browser ^6.0.0
  electron ^1.0.0
  ios ^6.1.0

Checklist

• I've run the tests to see all new and existing tests pass - Travis CI ✅
• I added automated test coverage as appropriate for this change
• Commit Title is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• I've updated the documentation if necessary

[erisu]

I have rebased this PR.

[erisu]

Cordova-OSX deprecation notice was already posted to the repo and the Cordova website reflects it.

apache/cordova-osx#118

[erisu]

@brodybits thank you for the PR

[codecov-commenter]

Codecov Report

Merging #851 (86c6044) into master (42b4569) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #851   +/-   ##
=======================================
  Coverage   88.27%   88.27%           
=======================================
  Files          46       46           
  Lines        2123     2123           
=======================================
  Hits         1874     1874           
  Misses        249      249           

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