Fix #179 catch-all masking and add more test cases #201
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Fixes the incorrect masking in CatchAllToken.
TDS_CURDECLARE3 also does not obey the rules on token length, so it has been special-cased.
Additionally, all "Zero-Length" tokens are not actually zero-length; their length is defined by prior tokens in the stream, so it would cause unpredictable errors if they are encountered by the CatchAllToken; as such they now throw exceptions instead.