- added basic farming game mechanic - now the player can grow up plants (currently just corn plants), you should find  a farm hoe and seeds/sprouts and then you can press interact button ("E") to plant a herb and use LMB to remove it
- added new items: farm hoe, corn, corn sprout, steel ingot, steel sword
- updated visual of the game: added shadows, added outlines, updated some textures
- added farms to the settlements and farmer NPCs
- fixed some forests issues with world generation