libusb: support hotplug

[sanjay900]

Implement hotplug using hotplug events where supported, and a periodic scan where hotplug isn't available

For windows, the periodic scan in some scenarios had negative effects on controller responsiveness, as libusb_get_device_list can take a few seconds on some machines, so I've opted to instead hook into the nativeEventFilter and implement a native hotplug myself.

• migrated from lambda calls to const whitelist structure, and have merged the emulation aspect into this
• Use a combination of the device port, address and vid and pid for differentiating devices, as suggested by some sample code from libusb
• Implemented native hotplug with a small delay as usb hotplug events tend to arrive before devices are fully enumerated
• If multiple LDDs match a device, only the first LDD wins and creates a device
• Close any open pipes when a device gets disconnected
• Set a pads status to disconnected when unregistering an LDD pad

Changes are based on #9096

Fixes #9071
Fixes #15074

[sanjay900]

It seems on some windows machines, libusb_get_device_list can take a few seconds to run, which is really not acceptable as it means every 4 seconds you end up with a dropped input.

Since we are only really using hotplug events as an indication of when to rescan, its easy enough to hook into the windows device change events, and then use that as an indication of when to run the rescan next