Feature/new build process and scripts

[codebude]

This PR implements the following features:

• Added strong name signing as requested in multiple issues
• Move build "engine" from MyGet.org (Batch script) to Github.com (yml-based actions)
• Adds .NET 5.0 as new, additional target

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@d907ed1). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #331   +/-   ##
=========================================
  Coverage          ?   61.95%           
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  Files             ?       17           
  Lines             ?     2560           
  Branches          ?      486           
=========================================
  Hits              ?     1586           
  Misses            ?      906           
  Partials          ?       68           

Flag	Coverage Δ
net5.0	62.71% <0.00%> (?)
net5.0-windows	61.83% <0.00%> (?)
netcoreapp2.0	58.79% <0.00%> (?)

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