Changes

• Removed carts mechanic and replaced it with a production chain mechanic.
• Added new needs. Houses can now be upgraded up to level 15.
• Added new items and buildings for better early start.
• Removed quests and added a short introduction instead. In later patches i'll add help tooltips for better explanations.
• Improved UI.
• Improved performance.
• Simplified items.
• Tiles now need to be discovered with gold.
• Resource spots can now be removed with gold.
• All buildings cost now only gold again.