[libretro] improved LightGun, Terebi Oekaki & Pico pointer precision
[libretro] improved LightGun, Terebi Oekaki & Pico pointer precision

frangarcj/Genesis-Plus-GX,frangarcj/Genesis-Plus-GX,DavidKnight247/Genesis-Plus-GX,frangarcj/Genesis-Plus-GX,Oggom/Genesis-Plus-GX,Oggom/Genesis-Plus-GX,Oggom/Genesis-Plus-GX,DavidKnight247/Genesis-Plus-GX,DavidKnight247/Genesis-Plus-GX,DavidKnight247/Genesis-Plus-GX,Oggom/Genesis-Plus-GX,frangarcj/Genesis-Plus-GX