final touches in the MOP

[vyzo]

The t::t type, system and shadow classes, and generics based on classes instead of type ids.

Everything has classes now!

TODO:

• [x] define system classes
• [x] define meta types for system and known shadow classes in prelude
• [x] bootstrap
• [x] update std/generic to use the new infrastructure
• [x] tests

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[drewc]

:)