Vendors, item stuff and new commands

Vendors are now working! (Although without support for repairing and
buyback)
How about you visit our first vendor, Supply Sergeant Maddrey, in Alias
Das and shop for some ammo?

Other changes:
*) Item stacksize now supported
*) Added a few spawns to Alias Das and surroundings
*) Added about 170 new items (mostly consumables and ammo)

New chat commands:
*) .alwaysfriendly - Will make enemy creatures not attack you on sight
*) .obj - Spawns an entity with a specific classId, useful for testing
objects
*) .addspawn - Permanently adds a spawn at the current location (spawn
is also saved in DB) Format: .addspawn mode animType respawnTime
creatureType1 minCount1 maxCount1 creatureType2 minCount2 maxCount2 ...
For example values take a look at the 'spawnpool' and 'creature_type'
mysql tables.