[Feature Request]: Autoconfig like Retroarch

[AngeloScipione]

Description

Add a folder where users can add files that asign raw inputs of a controller (example button "1" or axis "+0") to xinput's names (example "A").
Later, when a user press this button in PCSX2 controllers settings, it will show theses names instead of generic inputs).
Also, Automatic Mapping and PCSX2 ingame menu will use theses inputs.

Reason

• Make controllers configuration more easy between systems (example SDL conflicts between controllers).
• Very Upgradable compatibility of controllers (using retroarch's autoconfig compatible is a great sinergy).
• Improvement performance of automatic mapping and ingame PCS2 menu.

Examples

Retroarch.
Autoconfig github: https://github.com/libretro/retroarch-joypad-autoconfig.

[Mrlinkwii]

automatic mapping already exists with sdl et al and the pad.ini can be edited if you wish to do so