Multi-protocol

Lots of chagnes to add multi protocol flexibility, not really
completed yet, still have to rework text messages opcodes and other stuff,
so this still a working in progress feature

* Rework dat reader, the dat reader can now
* dinamically detect dat version
* Split game into gamelib and game_interface
* Lots of other minor changes

modules/gamelib/market.lua

@@ -0,0 +1,38 @@
+MarketAction = {
+  Buy = 0,
+  Sell = 1
+}
+
+MarketRequest = {
+  MyOffers = 0xFFFE,
+  MyHistory = 0xFFFF
+}
+
+MarketOfferState = {
+  Active = 0,
+  Cancelled = 1,
+  Expired = 2,
+  Accepted = 3,
+  AcceptedEx = 255
+}
+
+MarketItemDescription = {
+  Armor = 1,
+  Attack = 2,
+  Container = 3,
+  Defense = 4,
+  General = 5,
+  DecayTime = 6,
+  Combat = 7,
+  MinLevel = 8,
+  MinMagicLevel = 9,
+  Vocation = 10,
+  Rune = 11,
+  Ability = 12,
+  Charges = 13,
+  WeaponName = 14,
+  Weight = 15,
+
+  First = Armor,
+  Last = Weight
+}