Ignore UseElement width, height, x and y if transform is used. Fixes for symbol transformations.

I might not cover all the use cases but it seems that these properties have to be used differently for UseElements or they have to be applied after transform:

The ‘use’ element has optional attributes ‘x’, ‘y’, ‘width’ and ‘height’ which are used to map the graphical contents of the referenced element onto a rectangular region within the current coordinate system.
http://www.w3.org/TR/SVG/struct.html#UseElement

The ‘transform’ attribute is applied to an element before processing any other coordinate or length values supplied for that element. In the element
http://www.w3.org/TR/SVG/coords.html#TransformAttribute