Manifold properties are all internal

[BinarySpike]

Description

Properties of a Manifold are all set to "internal". Manifold.cs

Additionally, Contact.GetWorldManifold Contact.cs

This means while using the nuget package, I have no access to contact manifolds in a ContactListener

How To Reproduce

Create a new project using the nuget package and try to access oldManifold.points

Expected Behavior

Manifolds are accessible