Various bugfixes and tweaks

Fixed bug with open generic decoration

New package push to try to fix khellang#60

Fixed messed up signing

Various new features and improvements:

- Changed target frameworks to .NET Framework 4.6.1 and .NET Standard 2.0.
- Add option to scan exact namespace. See khellang#48.
- Update to the latest Microsoft.Extensions.DependencyInjection version. See khellang#50.
- Strong-named assembly. See khellang#53.
- Add support for registering all interfaces against a single implementation. See khellang#57 and khellang#58.
- Add source link support. See khellang#59.

Fixed bug where open generic types were registered as non-generic int…

…erfaces

Exclude compiler-generated types from scanning

Added support for scanning for open generic types.

Fix issue with chained calls to AddTypes and AddClasses

Fix AddClasses chaining by removing inheritance