add padding to RenderVertex

git-svn-id: svn://svn.code.sf.net/p/vpinball/code/trunk@514 14438d79-0ffd-4333-8ae7-ea2bdd901387
get rid of some more temporary vertex copies

git-svn-id: svn://svn.code.sf.net/p/vpinball/code/trunk@515 14438d79-0ffd-4333-8ae7-ea2bdd901387
some more cleanups

git-svn-id: svn://svn.code.sf.net/p/vpinball/code/trunk@516 14438d79-0ffd-4333-8ae7-ea2bdd901387