feat(windows): deprecate platform

[brodycj]

Status

• [ ] pending formal vote

Platforms affected

Windows

Motivation and Context

see this discussion in dev@cordova.apache.org

Description

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

Testing

updated:

In a local checkout of cordova-cli:

npm i github:apache/cordova-lib#brodybits-windows-deprecated
./bin/cordova create test1
cd test1

after adding Windows, ../bin/cordova platform ls gives me the following output:

Warning: using prerelease version 10.0.1-dev (cordova-lib@10.0.1-dev)
Installed platforms:
  windows 7.0.1 (deprecated)
Available platforms: 
  android ^9.0.0
  browser ^6.0.0
  electron ^1.0.0
  ios ^6.1.0
  osx ^6.0.0

Checklist

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

[erisu]

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

https://github.com/apache/cordova-windows/commit/0454321fec629741375d8964a921b4a4d91e4df7

[erisu]

I have rebased this PR.

[erisu]

@brodybits thank you for the PR

[codecov-commenter]

Codecov Report

Merging #852 (9368657) into master (42b4569) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #852   +/-   ##
=======================================
  Coverage   88.27%   88.27%           
=======================================
  Files          46       46           
  Lines        2123     2123           
=======================================
  Hits         1874     1874           
  Misses        249      249           

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