Work around another race condition.
Add Shimmer.
Update NuGet to 2.7.
Fix build command.

Packing fails with a cryptic error unless the Platform is specified.
Update NuGet packages.
Ignore "Releases" folder.
Use Any CPU in Debug.
Add assembly binding redirect for NuGet.Core.

This fixes a crash in Squirrel when applying a release.
Ensure that app.config is installed.