Removed not used files
Get rid of the Runtime namespace

clean.cmd fixes
Cleanup namespaces
Cleaning up extensibility
Extensibility cleanup
Refactoring extensibility
Refactoring extensibility
Extensibility cleanup
Extensibility cleanup
Extensibility cleanup
Extensibility cleanup
Extensibility cleanup (ParseRule)
Extensibility cleanup (ParseRule)
Replaced multiple precedence attributes with single PrecedenceAttribute.
Better ParseAttribute signature for specifying Precedence.
Hide internal BnfGrammar members
Get rid of the build assemblies in runtime folder.