vectorizing gtk-theme

I have not been able to fully switch to vector graphics because of the way gtk handles stretching. The border-setting in gtkrc works wonderful for raster images, but not for vectors. But, this updated theme handles scaling for touchscreen-settings.

IMPORTANT
This update includes gradients in some of the images, and it would be great if someone with an ancient pc could test how this affects the performance. Theoretically, gradients are heavier than mono-colors, but if this is noticeable - I don't know.