RFC: use svg for widgets instead of png/gif

Just an idea, which I'd like to hear people's thoughts on. What if we 
were to have no bitmaps in the xwt widgets. All buttons, etc., in the 
core widget set could be implemented as SVG.

Pros:
1) Fully scalable vector based UI. Great for accessibility, etc.
2) No external dependencies...all UI specified in XML.
3) Interesting programmatic transformation possibilities (rotation, 
color, etc)

Cons:
1) rendering overhead (addressable by caching rendered versions?)
2) additional widget development learning curve
3) unknown svg bugs/limitations in xwt core

Thoughts?

-Tupshin