Enhancement: FlxBackdrop Stage element

[ChickenSwimmer2020]

Please check for duplicates or similar issues before creating this issue.

What is your suggestion, and why should it be implemented?

I think that we should be able to add FlxBackdrop elements through the stage editor and be able to visualize the movement of said backdrops in the stage editor

[r6915ee]

Hm, this should be fairly easy to implement via scripting alone; the API for FlxBackdrop is relatively simple and only requires around six lines of genuine code in a stage script (note that I haven't tested it, but I believe the below script should work).

import flixel.addons.display.FlxBackdrop;

var bg:FlxBackdrop;

function create():Void {
    add(bg = new FlxBackdrop(Paths.image("stages/mystage/tiling")));
    bg.velocity.set(2, 2);
}

[ChickenSwimmer2020]

right, and i already know how to do that, i just think that ease of use for FlxBackdrop would be nice

[ItsLJcool]

The stage editor is kinda fucked, and there is a semi-active PR that reworks the stage class entirely, so along side it will the Stage Editor get a re-work as well.