* Bump %unicode 9 -> %unicode 12.1 for the 3 unicode grammars
* regenerate emoji conformance tests for unicode 12.1
* modify wordbreak conformance tests to use emoji data (which replaces old crazy E_base etc properties)
* regenerate wordbreak conformance tests
* Simplify grammar files and word-break conformance test generator, now that full-width numbers are WordBreak=Numeric
* Use jflex emoji properties rather than ICU-generated ones