fixed tests that were using print

Add comment to parser about document directive

run prettier

fix git status

move semantic nullability tests to their own file

better SemanticNullable docs

rename to SemanticNullable

logging cleanup

SemanticOptional cleared

SemanticNonNull halts null propagation

some new semanticNullability execution tests

printer and parser tests passing

parser tests passing

Revert "[RFC] Client Controlled Nullability experiment implementation…

npm test passing

full coverage

Validation stripped back, all tests passing

Stripped back CCN lexer/parser tests passing