Add support for Resizable Chat Display

[Hotrian]

In a future version, I would like for you to be able to either select from a list of choices of different shapes, or possibly add sliders that let you control the width and height, but because there are a number of elements that must be resized to do this, I haven't come up with a clever way to do it yet, and so this is on the back burner.

One or the other, or possibly both features are incoming, but no ETA.