Damage balancing

Constants now controls dmg.

These are direct dmg, they do that amount one time when hit
+        public static int DMG_WHIP = 30;
+        public static int DMG_KNIFE = 50;

// This dmg gets done per second (calculated at dmg * refreshTime /
1000) for as long as monster is on fire
+        public static int DMG_FIRE_PER_SEC = 30;
For this, I created LENGTH OF ON FIRE for the monsters, it's 5s for
mummy and 2s for the rest.

// This is a bit more complicated.
// dmg is calculated by (% weight) * (% speed) * max_dmg
// Change either % speed or max dmg to affect this one.
+        public static int DMG_MAX_ROCK = 60;
+        public static int MAX_SPEED_ROCK = 1000;