Moved `net/base64' code from unit to module.
Moved `net/base64' code from unit to module.

original commit: 01041988759108dc93201ea8825dabd7bb651d1b

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket