Remove package dependencies and don't publish analyzer as a lib

[MattKotsenas]

Fixes #31.

Address two related issues:

1. Don't pack the analyzer in the lib/ folder, as that makes it an input to the user's compilation
2. Because there is no lib, suppress the dependency on .NET Standard 2.0, as that's an implementation detail of the analyzer and not a requirement of the package.

To do that I also removed the <NoPackageAnalysis>, which disables all package analysis, and instead fixed the raised issues via <IncludeBuildOutput> and <SuppressDependenciesWhenPacking>.