Create parallel data structure for types to fasten up lookups later.

[sqeezy]

When profiling application build times I noticed that a lot of my performance went into a List.Contains call.
This seems like a problem that's easily solved. I'm well aware that I might have missed some detail here, but this kind of change would bring a lot of performance to applications registering a lot of components.

This is just a rough draft, but I would be very much interested in your input and explanations.

Thank you!

[jonorossi]

Makes sense with the util method being used from 2 places.

Naming wise, let's go with the purpose rather than "fast" to keep it consistent.

Watch out for code formatting to kept things consistent.

Can you also update the changelog.

[sqeezy]

All your proposed changes are commited.
I think the formatting did not get changed in the process.