keymapping for games on V3

[t3d]

The games provided by avn aren't playable on V3, as V3 doesn't have cursor keys for 4 directions. V3 has only left/right keys. Maybe we could use vol+/vol- as up/down keys? Otherwise there is a conflict in sudoku, which needs the digit keys (1-9).

[dottedmag]

Feel free to fix keymappings, though it's not critical for 0.2

[t3d]

let's add

KP_Add=Up KP_Subtract=Down

to epuzzles.ini