Add printing capabilities for enums

[cattabiani]

Right now enums are C++ base enums. They lack the capability to print their names (and some other small features). We could create a "super_enum" class (please, feel free to change the name) that has enums properties + it prints its name (not a number). This class can be templated with Jinja or just C++ templates or both (depending on how many enums we have).