Add support for more controllers: maracas (Samba de Amigo), Pop'n Music, ...

[AltoRetrato]

Hi there!

On a quick glance at the source of flycast, it seems to support several Dreamcast peripherals (even lightguns!), but it doesn't seem to support maracas for Samba de Amigo and Samba de Amigo: Ver. 2000 or the Pop'n Music controller.

(Images from https://bordersdown.net/content/400-Dreamcast-Peripherals-and-Hardware-List-with-photos&new_comment)

Would it be possible to add support for at least the maracas controllers in flycast?

Of course, there is also the issue of connecting those peripherals to the computer running flycast, but they can also be emulated with other devices (e.g., VR controllers).