Add optional support for L-trigger on controllers.

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Vinícius R. Miguel 3 years ago committed by GitHub
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      enhancements/L-trigger-mapping/README.md

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# L-trigger mapping
Some parts of the code might require the pressing of the L-trigger for testing reasons.
If you need that, alter `controller_sdl.c`.
In the following line:
```
if (SDL_GameControllerGetButton(sdl_cntrl, SDL_CONTROLLER_BUTTON_LEFTSHOULDER)) pad->button |= Z_TRIG;
```
Replace `Z_TRIG` with `L_TRIG`, save and rebuild.
On a DS4, this now means that Z-trigger will be mapped to L2 and the L-trigger to L1.
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