Pkcs11Interop 5.1.2

• #150 - Enabled deterministic builds
• #173 - Fixed problem with too small buffer used for encryption and decryption of streams
• #177 - Moved Linux and macOS CI builds from Travis CI to AppVeyor
• Replaced deprecated PackageLicenseUrl with PackageLicenseFile and PackageIconUrl with PackageIcon in NuGet package