Artifact Format

See thread http://forum.vcmi.eu/viewtopic.php?t=558 for discussion

Artifact abilities use Bonus Format.

TODO:

• Combined artifacts identified by string
• Artifacts growing with Commander level

{
	"type": "HERO", //CREATURE, COMMANDER
	"class": "TREASURE", //MINOR, MAJOR, RELIC, SPECIAL
	"slot":	"HEAD", //SHOULDERS, NECK, RIGHT_HAND, LEFT_HAND, TORSO, RIGHT_RING, LEFT_RING, FEET, MISC1, MISC2, MISC3, MISC4,
		MACH1, MACH2, MACH3, MACH4, SPELLBOOK, MISC5
	"value": 12000, //based on ARTRAITS.txt		
	"text":
	{
		"name": "Big Sword",
		"description": "Big sword gived +10 attack to hero",
		"event": "On your travel, you stumble upon big sword. You dust it off and stick in your backpack"
	}
	"image": "BigSword.png",
	"bonuses":
	{
		Bonus_1,
		Bonus_2
	}
}