Cherry pick virtual joystick fix from Stable

Rework Fly View into separate layers which can be customized at each layer.

When the item is not visible, the width and height are not valid,
resulting in wrong output values
Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

This allows you to arm

- Positions are bounded to rectangle
- No longer re-centers if thumbs go outside bounds
- ThumbPad moves to meet first thumb position, this prevents
inadvertent movement as you put your thumb down