[$90] Multiple gamepads to a RetroPad (N to 1) and vice versa (1 to N)


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Github issue: https://github.com/libretro/RetroArch/issues/7830

How to make two different buttons do the same function (fire)

Bounty up to $30 – thanks @robertvb83!


Bounty up to $90 thanks to a $60 contribution from libretro organization bounty funds!