* Change project layout to prepare for upcoming Arcade changes
* Add signtool config file to configure OPC, NuGet, and Authenticode signing
* Fix a bug when BaseIntermediateOutputPath is set to an absolute path
Updates ASP.NET package versions to 2.1
Tweaks TFMs
- libraries = netstandard2.0
- exes/apps/tools = netcoreapp2.1
- unit tests = netcoreapp2.0
- e2e tests = netcoreapp2.1 (dependency on apps)
The exception to this is the Browser.JS project which depends on our
tool for its build. however this project just builds the js code so its
TFM doesn't really matter.