Suggestion: extend FST classes to S3M classes

[jvcoutinho]

Instead of having to manipulate classes from FeatureHouse dependency to achieve our goals, we could extend those we need.

For example, instead of manipulating FSTTerminal or AbstractFSTPrinter (FeatureHouse's pretty-printer), we could have a S3MTerminal or S3MPrettyPrinter, extending the previous ones respectively. Then, we could put there whatever we want/need. It would be easier to manage and edit.

[jvcoutinho]

what do you think, @guilhermejccavalcanti @pauloborba?

[guilhermejccavalcanti]

In think this is a good idea.