== DETAILS
RetroArch's general HID drivers are intended as a full-on substitute for
other input drivers such as XInput, DInput, SDL, etc. The Wii U port is,
to my knowledge, the first case of heterogenous input drivers working
concurrently.
As such, I've moved things around:
- The HID driver source is moved into the wiiu/input/ directory alongside
the joypad subdrivers.
- We no longer use the input_hid_init_first() method to instantiate; instead
we just init the wiiu HID driver directly.
- The HID pad driver and HID subsystem driver enjoy a tighter coupling,
mainly having to do with the initialization of the joypad connections
list, because there's no way to inform the HID driver's init() method
how many slots to allocate.
== TESTING
Will test in a moment, but at least it compiles cleanly. ;)
