setFPSCamera method of GameScene in input events

[AlmasB]

Discussed in #1185

^{Originally posted by feiniao5643 July 20, 2022}
First of all, please forgive me for my bad English.
I'll skip the usual preliminaries and come straight to the point.
I use this API in initGame,It's normal.
@Override protected void initGame() { camera3D = FXGL.getGameScene().getCamera3D(); FXGL.getGameWorld().addEntityFactory(new GameEntityFactory()); camera3D.setMoveSpeed(500); camera3D.getTransform().setZ(-200); camera3D.getTransform().setAngle(30); **FXGL.getGameScene().setFPSCamera(true);** FXGL.spawn("铁骑兵",0,0,0); }
But I can't use it in mouse events.
`FXGL.getInput().addAction(new UserAction("Mouse Turn") {
@OverRide
protected void onActionBegin() {
FXGL.getGameScene().setFPSCamera(true);
}

        @Override
        protected void onActionEnd() {
            System.out.println(0);
            FXGL.getGameScene().setFPSCamera(false);
        }
    },MouseButton.SECONDARY);`

Finally, the function I want to achieve is that when the right mouse button is pressed, the camera moves with the mouse, and the camera is fixed after release.