Added test for encoding untouched default/optional sequence/set fields (this currently does not work in the .NET library so the test is commented out there)
ANTLR grammar renamed and moved as required by more recent versions of the ANTLR Maven plugin
Code improvements
Added support for Enumerated with default value
Fixed equality testing for Enumerated types
Added tests for encoding Enumerated with default value
Enabled test for encoding untouched defaults (provisionally, with the int value set)