Emscripten gamepad event draft

[Jonathhhan]

This is a (well) working draft for using gamepads with Emscripten (tested with an xbox one controller).
https://emscripten.org/docs/api_reference/html5.h.html#gamepad
I got most of the code from this test / example: https://chromium.googlesource.com/external/github.com/emscripten-core/emscripten/+/refs/tags/1.38.39/tests/test_gamepad.c
Here is a good page for reference: https://gamepad-tester.com/

The event array:

static inline const char* emscripten_event_type_to_string(int eventType) {
  const char *events[] = { "(invalid)", "(none)", "keypress", "keydown", "keyup", "click", "mousedown", "mouseup", "dblclick", "mousemove", "wheel", "resize", 
    "scroll", "blur", "focus", "focusin", "focusout", "deviceorientation", "devicemotion", "orientationchange", "fullscreenchange", "pointerlockchange", 
    "visibilitychange", "touchstart", "touchend", "touchmove", "touchcancel", "gamepadconnected", "gamepaddisconnected", "beforeunload", 
    "batterychargingchange", "batterylevelchange", "webglcontextlost", "webglcontextrestored", "mouseenter", "mouseleave", "mouseover", "mouseout", "(invalid)" };
  ++eventType;
  if (eventType < 0) eventType = 0;
  if (eventType >= sizeof(events)/sizeof(events[0])) eventType = sizeof(events)/sizeof(events[0])-1;
  return events[eventType];
}

Could be useful for other events to.
The gamepad events need to be updated every draw cycle (or as often as you want to get the output).
Not sure, if I put the things at the right place, but I think its a good start.
Where it hangs again is, that I do not now how to pass those values in the best way to ofApp.cpp.
Once I made a simple class, there I used notify: https://github.com/Jonathhhan/OF-GUI-library
And then I have a general question about formatting the code correct (in OF style), sometimes not sure where to leave a space and where not etc....