Add rebind joysticks

[wrrrzr]

Add compact, short information about your PR for easier understanding:

PR Added support for rebind joystick

To do

This PR is a Work in Progress.

• Add class GUIJoystickChangeMenu
• Buttons Save/Cancel
• Draw joystick scheme
• Allow rebind joystick
• Translation

How to test

PR is work in progress

[rollerozxa]

Probably worth noting that the current joystick & controller support provided by Irrlicht is for the most part useless due to its unreliability. It is being planned on being replaced by SDL's gamepad support so spending time on the support provided by Irrlicht may not be worthwhile.

[y5nw]

I'm not sure whether I exactly agree with the approach of this PR.

Looking at this (and also #14964), it makes more sense IMO to wait until we rely on SDL (i.e. drop non-SDL devices) and then modify KeyPress to something along the lines of

class KeyPress {
public:
  enum InputType { KEYBOARD, MOUSE, JOYSTICK };
  bool operator== (const KeyPress &o) const {
    return type == o.type && button == o.button;
  }
  ...
private:
  InputType type;
  u32 button; // keyboard: scancode; mouse/joystick: button on the device.
};

after which we can then use KeyPress for input handling and use the key change menu to bind joystick controls. (Edit: Alternatively, I wonder whether we can simplify things by registering keyboard/mouse/touchscreen controls as virtual joysticks in SDL.)

Also aren't we moving to Lua formspecs with #15614? Using a C++/Irrlicht GUI form in the style of the current GUIKeyChangeMenu is IMO against that goal.