[macOS] Add MayFlash Dolphinbar support

[manuthebyte]

As I have seen it, in Windows you can connect Wiimotes to Cemu with the Dolphinbar.

Is there a possibility to implement this on Mac also?

[qurious-pixel]

Duplicate of #505

[apparition47]

Reading through this comment, I was able to get it working with gamepad-tool then exporting a SDL gamepad mapping env var and launching Cemu like this:

SDL_GAMECONTROLLERCONFIG="03000000790000000318000000010000,Dolphinbar SDL,platform:Mac OS X,a:b8,b:b12,x:b0,y:b4,back:b16,guide:b44,start:b20,leftshoulder:b28,dpup:h0.1,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,leftx:a0,lefty:a4,lefttrigger:b24" /Applications/Cemu.app/Contents/MacOS/Cemu

With Dolphinbar in mode 3, I was then able to see my Wiimote in Cemu > Input settings. This SDL workaround doesn't work with multiple Wiimote controllers and seems to need dev work in Cemu for support.

EDIT: as a workaround for multiple controllers, I ended up using Enjoyable to map the other 3 Wiimotes to the keys on the keyboard then in Cemu>Input Settings>controller: Keyboard, map the corresponding keyboard keys to players 2-4.