TypeString: improve handling of FQN true/false/null
#702
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TypeString::isNullable(): correctly handle FQN null
Includes tests.
TypeString::isKeyword(): correctly handle FQN null/true/false
Includes tests.
TypeString::normalizeCase(): normalize FQN true/false/null to unqualified
Includes tests.
TypeString: add more tests with FQN true/false/null