another colorkey fix for static solid ramps

git-svn-id: svn://svn.code.sf.net/p/vpinball/code/trunk@980 14438d79-0ffd-4333-8ae7-ea2bdd901387
Merge branch 'master' into dev
First step to variable timesteps.

Made accelerations and positions update correctly.
Disabled friction and scatter to ensure consistency.
Trying to reestablish proper friction value for playfield
Marked some more places which depend on the physics step.
Also disabled scatter on kicker for consistency for now.
First attempt to model proper rolling/slipping of ball.
Added mass to ball.
Finished transition to ball velocity as a vector.
Removed playfield friction since it's now included in the rolling dynamics.
Some debug output for slipping/rolling, disabled now.
Implemented collisions with friction for ball/wall collision.
Infrastructure for handling contacts.
Playfield and top glass collisions are now handled as true collision objects including contact.
Made contact debug counter use new contact mechanism.
LineSegs can now also handle contacts.
Changed gravity constant to the physically correct one.
Basic flipper contact implemented, but disabled for now.
Made ball friction computation more accurate; now includes static and dynamic friction.
Some fixes to contact force computation.