replace deprecated event api on macos

[Antoine Martin]

ie: ​CGPostMouseEvent: This function is not recommended for general use because of undocumented special cases and undesirable side effects. The recommended replacement for this function is ​CGEventCreateMouseEvent, which allows you to create a mouse event and customize the event before posting it to the event system.

Also CGPostScrollWheelEvent.

[Antoine Martin]

Example code:

    def move(self, x, y):
        CGWarpMouseCursorPosition((float(x), float(y)))

    def double_click(self, x, y, button=1):
        """button parameter is not currently used."""
        event = CGEventCreateMouseEvent(
                        None,
                        kCGEventLeftMouseDown,
                        (x, y),
                        kCGMouseButtonLeft)

        CGEventSetIntegerValueField(event, kCGMouseEventClickState, 2)
        CGEventPost(kCGHIDEventTap, event)

        CGEventSetType(event, kCGEventLeftMouseUp)
        CGEventPost(kCGHIDEventTap, event)
        CGEventSetType(event, kCGEventLeftMouseDown)
        CGEventPost(kCGHIDEventTap, event)
        CGEventSetType(event, kCGEventLeftMouseUp)
        CGEventPost(kCGHIDEventTap, event)

[migration script]

this ticket has been moved to: ​https://github.com/Xpra-org/xpra/issues/2955