Add githubEnabled setting to be used instead of downloadInfoFromGithub

[alejandrohdezma]

What has been done in this PR?

Add a new setting githubEnabled that will be used instead of downloadInfoFromGithub.

Instead of relying on environment variables, this new setting will be used via the following command aliases:

• github: Sets githubEnabled to true
• githubOn: Sets githubEnable to true
• githubOff: Sets githubEnabled to false

❗ Important note. The downloadInfoFromGithub has been deprecated and will be removed on version 0.9.0 along with using DOWNLOAD_INFO_FROM_GITHUB environment variable mechanism. If anyone wants to keep that functionality, add the following to build.sbt:

ThisBuild / githubEnabled := sys.env.contains("DOWNLOAD_INFO_FROM_GITHUB")

[codecov]

Codecov Report

Merging #178 into master will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #178   +/-   ##
=======================================
  Coverage   82.60%   82.60%           
=======================================
  Files          21       21           
  Lines         184      184           
  Branches        1        0    -1     
=======================================
  Hits          152      152           
  Misses         32       32           

Impacted Files	Coverage Δ
...m/alejandrohdezma/sbt/github/SbtGithubPlugin.scala	0.00% <0.00%> (ø)

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