Changed config

Power-ups
- Increased speed of Ice Projectile to 30 from 20
- Decreased speed of ET to 15 from 20
//Thus the Ice Projectile is better for sniping ranged targets while the
ET is more useful against groups, especially since its AoE

Playing Field
- Slightly increased the height of the arena while drastically
decreasing the length of it
//This makes the playing field more cubical, which is useful for maps
like Rift (to avoid dividing the map with the wormhole). Another effect
is that players are more careful when accelerating since arena is
smaller, thus hopefully reducing the number of eliminations by the
players own mistake