Create NPC system

[FacelessLord]

NPCs are types of Entity that player able to speak, trade with, take quests from.
Each type of NPC should have it's own class and folder.
Folder will contain:

• sprites for NPCs
• list of names that can be used
• list of world lines - phrases that NPC will say if you walk near.
• files that describe dialog structure
• maybe some script files that describe, how NPC will behave
• standard entity data like Health, Respawn time(if exists), Attack Damage, maybe Mana, List of enabled Entity Traits

Classes should:

• be able to load and save whole NPC type folder (Serialization)
• enable editing NPC in game by admin-player