Allow config header Access-Control-Allow-Origin on LocalServer module

[cbh6]

This will set allowOriginLocalServer: false in settings.json when scaffolding

When allowOriginLocalServer is set to true, it will set Access-Control-Allow-Origin = "*" header in LocalServer fileSystem responses.

Referenced issue #215

[codecov-io]

Codecov Report

Merging #216 into master will decrease coverage by 0.01%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #216      +/-   ##
==========================================
- Coverage   58.63%   58.62%   -0.02%     
==========================================
  Files          20       20              
  Lines        1494     1496       +2     
==========================================
+ Hits          876      877       +1     
- Misses        618      619       +1

Impacted Files	Coverage Δ
skeleton/app.js	5.74% <0%> (ø)	⬆️
skeleton/modules/localServer.js	82.74% <50%> (-0.34%)	⬇️

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