Integrate Pretendo network

[XargonWan]

Evaluate the integration of Pretendo netowkr

https://pretendo.network

[maddovr]

Currently, support is limited to only Cemu, Citra will not support it in the next future, even if it gets picked up. As there is no proper miiverse support in Cemu, and even creating Miis requires additional setup (and a "bios" extracted from the wiiu), we might want to close this issue for now until pretendo becomes more realistic, both games support and actual emulator support.