Gamepad identity fixes

[sl1nk3]

Problem

Many games (e.g. The Stanley Parable Ultra Deluxe, Kingdom Hearts, and others) have basic gamepad support where the buttons layout is hardcoded for specific controllers like Xbox and Playstation controllers. WinNative was advertising all gamepads as "Generic HID Gamepad" with fake vendor/product IDs (0x1234/0x5678), which broke recognition in these games.

Fix

This branch makes two changes:

1. Spoof Xbox 360 Controller identity by default. The fake input device now reports itself as an Xbox 360 Controller (VID 0x045E, PID 0x028E), which is widely recognized by games out of the box. The device name is "Xbox 360 Controller (%d)" instead of "Generic HID Gamepad %d".
2. New "Use Real Identity" per-controller toggle for external gamepads only. Added a checkbox in the external controllers input settings that lets a gamepad broadcast its real name, vendor ID, and product ID instead of the spoofed Xbox 360 identity. This can be useful when playing with a PlayStation controller in a game that has a dedicated PlayStation input path (i.e some games use HUD glyphs specific to PlayStation controllers when one is detected).

Tested locally on an AYN Thor with a Xbox One gamepad over bluetooth as well as a Playstation 3 controller.

[maxjivi05]

checking this out later today, sounds awesome.