Stricter trivia selection. #1304
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Improves #1272, this PR adds some more restrictions on when a constant value should be considered trivia.
In short, Fantomas cannot always trust the values of string, numbers and characters that are found in the Untyped AST.
That is why these are picked up via the F# tokens.
However, all strings, numbers and characters were detected all the time.
In this PR, we are only detecting them as trivia if they are indeed special cases.