- the former prevents using current-typecheck-relation at type/kind level
- the latter differentiates "well-formed" types (star)
from valid types (any kind)
- move define-*ed-syntax and *-eval into define-syntax-category
- turnstile must wrap define-stx-category to define new define-*ed-syntax
- add any-*? pred and any-* stx class in def-stx-category
- fixes#44
- fixes#45