Added 2D vector operations.


git-svn-id: svn://svn.code.sf.net/p/vpinball/code/trunk@964 14438d79-0ffd-4333-8ae7-ea2bdd901387
Added some comments to ramp code, cleaned up the code a bit.


git-svn-id: svn://svn.code.sf.net/p/vpinball/code/trunk@965 14438d79-0ffd-4333-8ae7-ea2bdd901387