Extract ATN deserialization to a new class ATNDeserializer
Add ATNDeserializationOptions class
Add the "verifyATN" deserialization option
Add option to generate rule bypass transitions during ATN deserialization
Merge pull request #358 from parrt/master

update changes file, tweak parser interp test to use new api
Merge pull request #357 from sharwell/atn-deserializer

ATN deserializer