Revert "Update SSInterpreter.hs"

This reverts commit 550c95ba2a5def1253fc5b4f2b559e96e11ea75b.
Revert "inclusão da classDec, para declaração de classes"

This reverts commit 321be9a2d0a448b634c62b5a0c318a9bdaabcc71.
Revert "Update LispVal.hs"

This reverts commit 475fbf517dbf15674cbaf5dbae068940cf5cff9b.