Update 0.6

Features

• Upload, download save in option menu.
• Recycling center : Convert trash to resource
• Trash item underground.
• Contract now appear up to 5 at the same time.
• Increase ore spawn early game.
• Add notice when contract completed, failed.
• Guide shortcut in some dialog.

Bugs

• Fixed save file error when loading across version.
• Audio is now on by default