[cocoa] Support dpad/POV hat switch [e.g. directional buttons on DualShock]

[nickolay]

This seems to be a known limitation (mentioned in the commit introducing the DS4 buttonmap), but hard to find, unless you know the right terms or take a deep dive into the code.

These are reported as:

• IOHIDElementGetUsagePage(..) = GENERIC_DESKTOP_USAGE_PAGE (0x01)
• IOHIDElementGetUsage(..) = 0x39
• IOHIDValueGetIntegerValue(..) ranging from 0 to 7 indicating eight possible directions and an out-of-range (8 for DS4) value for the unpressed state (as explained here).

...and should end up calling CJoystick::SetHatValue.

One can look into https://bugzilla.mozilla.org/show_bug.cgi?id=1107801 for implementation inspiration.

[garbear]

We have a PR for GCController support. @fuzzard how is that one going?

[fuzzard]

From memory, just had some cleanup to do from comments, just havent followed up on it.

[garbear]

xbmc/xbmc#18790 was merged back in 2021. Can this issue be closed?