Add support for gradientTransform matrix

[ghost]

Doesn't minify a or with a gradientTransform attribute set to a matrix() function.

[RazrFalcon]

gradientTransform is supported.

[ghost]

I had an SVG with gradientTransform="matrix(0.03 0 0 0.3 2 2)" but this was not processed so I did it manually :/ Are you sure matrix() is supported as well as transform() and/or scale()

[RazrFalcon]

Only proportional scale and translate are supported. Everything else cannot be applied.
I'm not sure how exactly you're applying it manually.

[ghost]

I calculated the translated and scaled gradient handles, then checked my working with Inkscape.

Gradients are simple to support this feature with, I assume paths are much more complex

https://developer.mozilla.org/en-US/docs/Web/CSS/transform-function/scale()