Introduction of structural ast nodes

Adds structural node category into AST, facilitating the distinction between expression nodes, structural nodes (e.g. statements, assignments, etc.) and other node types.

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• 84b4c13b - Fix typecheck

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requested review from @da15siwa

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• 7991adb6 - remove various casts. clean up type annotations. fix one small bug.

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assigned to @zy69guqi

I pushed some additional changes - most of the cast calls were unnecessary as mypy could narrow the types by itself, and I found it more sensible to resolve the typing using overloads and runtime checks in the remaining cases.

If you're fine with the additions, feel free to merge.

mentioned in commit 1998bc1e

merged