Add exclusive camera feature

[rexrainbow]

Please do not update the README or Change Log, we will do this when we merge your PR.

This PR (delete as applicable)

• Adds a new feature

Describe the changes below:

Exclusive camera will ignore all game objects, only render accepted game objects.

Test code

class Demo extends Phaser.Scene {
    constructor() {
        super({
            key: 'examples'
        })
    }

    preload() {
    }

    create() {
        var camera1 = this.cameras.main;

        var camera2 = this.cameras.add(400, 0, 400, 600)
            .setBackgroundColor(0x333333)
            .setExclusive();

        var gameObject0 = this.add.rectangle(200, 100, 100, 100, 0xffffff);
        var gameObject1 = this.add.rectangle(200, 400, 100, 100, 0xffffff);

        camera2.accept(gameObject0);
    }

    update() { }
}

var config = {
    type: Phaser.AUTO,
    parent: 'phaser-example',
    width: 800,
    height: 600,
    scale: {
        mode: Phaser.Scale.FIT,
        autoCenter: Phaser.Scale.CENTER_BOTH,
    },
    scene: Demo
};

Put gameObject0 on camera2, so it will only be rendered by camera2. And gameObject1 will only be rendered by camera1.

[blinkdog]

Noticed a typo here: Camera.accept

[rexrainbow]

Noticed a typo here: Camera.accept

Thanks, had fixed this typo.