Third update introduces rocketry and oil!

(If you have any thoughts about the update, feel free to write a comment, or share you feedback).

• New Trees: 
  • Lemon Tree
  • Cherry Tree
• New randomly generated structure: oil crater
• New Buildings:
  • Water Storage
  • Oil Pump
  • Oil Pipe Connector
  • Rocket Pad

• New Cursor
• New Rocket Launches System:
  • Rocket require oil to be launched
  • After successful launch rockets bring you money and research points

• Finally fixed all wires/pipes connection bugs ^_^

• Sprinkler research:
  • Cost: 300 -> 200