Created class ItemGenerator

Jeder ItemGenerator repräsentiert ein Item, dass auf der Karte liegt
added getInventory() in Player
added Testitem in the first Level

+Formatierung
added add actors Method to be able to add multiple Actors of one Type at a time
changed number of actors in Level 1
Player now starts at the playerstart(®)

Added playerstart attribute in class World
Merge pull request #56 from Schachus/master

Added possibility for items to lay on the map(Item Generator), Player now starts at ®, added more Monsters in Level 1(according to balance)