Support SVG Aspect Ratio .maintain_aspect_ratio(true)

[dxshie]

Is your feature request related to a problem? Please describe.
When loading an SVG you'll get a ImageSource which has a method called
.maintain_aspect_ratio(true) but that does not work for SVG's
if i try to paint an svg with .paint_at the image will be scaled depending on the size of the specified rect.
i want the image to be painted inside that rect centered and keeping it's aspect ratio

Describe the solution you'd like
if .maintain_aspect_ratio(true) would work for svg's as well then that would be great

Describe alternatives you've considered
using a png instead but then i have to convert my svg's and have bigger file sizes