tablet support now fully working  :)

current mapping:
 upper left - add credit
 middle upper left - left magna save/2nd button
 middle lower left - left flipper
 lower left - start
 upper right - quit
 middle upper right - right magna save/2nd button
 middle lower right - right flipper
 lower right - plunger 

git-svn-id: svn://svn.code.sf.net/p/vpinball/code/trunk@868 14438d79-0ffd-4333-8ae7-ea2bdd901387