Variable damage to/from mobs

* Player weapons and armor ratings are taken into account when damaging/getting damaged by mobs.
* Players have a 5% chance to critical strike mobs, this doubles the player's weapon power.
* Aside from player and mob stat based damage variance, there is also an inherent 20% variance to any damage.

src/ItemManager.hpp

@@ -5,7 +5,7 @@
 
 struct Item {
     bool tradeable, sellable;
-    int buyPrice, sellPrice, stackSize, level, rarity; // TODO: implement more as needed
+    int buyPrice, sellPrice, stackSize, level, rarity, pointDamage, groupDamage, defense; // TODO: implement more as needed
 };
 struct VendorListing {
     int sort, type, iID;
@@ -49,4 +49,5 @@ namespace ItemManager {
     int findFreeSlot(Player *plr);
     Item* getItemData(int32_t id, int32_t type);
     void checkItemExpire(CNSocket* sock, Player* player);
+    void setItemStats(Player* plr);
 }