Replace "zoom" with FlxSprite.scale property for SustainTrail.hx #6367
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Normally because of how sprites are drawn with FlxStrip, properties that would be available in FlxSprite like "scale" and "angle" aren't able to be used and do nothing.
This PR adds the ability to be able to use FlxSprite.scale instead of the zoom property to be able to mess with the scaling of a sustain note.
By default, scale.y being 1 represents the default length of the sustain note being controlled (so for example, if you set scale.y to 0.5 then the sustain note will be 50% of it's actual length but will still work), meanwhile scaling x controls the actual width of the sustain note instead of the original zoom property.
Seeing as the zoom property is a private variable in the original class and is only used to initialize the sprite, I don't think this is really a breaking change, but idk.
If you have any suggestions for what to add to this feel free to let me know, as well as if this PR has any issues.
Demonstration here:
