SVGRenderer internal namespace

I had some trouble caused by the internal namespace:

* The definition com.lorentz.SVG.svg_internal depended on by com.lorentz.SVG.display.base.SVGElement in the SWC /Users/krueger/workspace/.../libs/SVGRenderer.swc could not be found
* The definition com.lorentz.SVG.svg_internal depended on by com.lorentz.SVG.display.base.SVGTextContainer in the SWC /Users/krueger/.../libs/SVGRenderer.swc could not be found
* The definition com.lorentz.SVG.svg_internal depended on by com.lorentz.SVG.display.SVGDocument in the SWC /Users/krueger/workspace/.../libs/SVGRenderer.swc could not be found
* The definition com.lorentz.SVG.svg_internal depended on by com.lorentz.SVG.display.SVGTSpan in the SWC /Users/krueger/workspace/.../libs/SVGRenderer.swc could not be found

So i removed the namespace declaration and the imports.

Also did some cleanup of unused imports.

Don't know if this is any use to others. If not - drop this pr.

Thank you for this awsome lib!