WIP on trying to better hanlde "bad" XMl where an attribute's value is unquoted and begins with a digit
TISTUD-6683 Gracefully handle invalid XML attribute values
- be able to handle unquoted attribute values that begin with digits in our scanner
- mark unquoted attribute values as parse errors and recover in our parser
- mark attributes with no value as parse errors and recover in our parser
Address review feedback
Merge pull request #224 from sgtcoolguy/TISTUD-6683

TISTUD-6683 Gracefully handle invalid XML attribute values