Fix grammar issues, add Comma production #1783
Merged
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Replaced "EnumShapeStatement" rule with "EnumStatement" because other shape statements don't include the word "Shape".
Renamed "NodeKeywords" to "NodeKeyword" since grammar rules aren't generally plural like this.
Added "Comma" production, which is now used in WS and can be optionally used after defining an enum member.
Members that support value assignment can now have a trailing comma.
Fixed WS loop handling for several productions.
Fixed OperationErrors to actually support a list of ShapeId, rather than just a list of Identifier. Identifier implies that you can only use errors in the local namespace which isn't the case.
Issue #, if available:
Description of changes:
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