mechanicals - Various implementations of the lambda calculus and friends.

	Commit message (Collapse)	Author	Age
*	backport check refactorings	JJ	2024-07-16
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*	backport interpret-/infer-/check- renaming and remove implicit params	JJ	2024-07-15
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*	stlc-ext, stlc-rec: backport bug fixes	JJ	2024-06-24
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*	broadly switch to infix operators	JJ	2024-06-21
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*	stlc-ext: conditional fixes and tests	JJ	2024-06-20
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*	stlc-ext: ascryption fixes	JJ	2024-06-20
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*	go all in on unicode: rename ctx and heap to \Gamma and \Sigma	JJ	2024-06-20
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*	stlc-ext: typecheck boolean and natural operations	JJ	2024-06-20
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*	add some typing rules, minor fixes	JJ	2024-06-20
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*	stlc-ext: add primitive operations on booleans and naturals	JJ	2024-06-17
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*	implement the simply-typed lambda calculus with simple extensions	JJ	2024-06-16