Loading and house building Patch 0.5.0-8

This patch should hopefully make loading saved sessions work better, fixes two annoyances in house creation, and get rid of some mysterious bugs with building after visiting your land.

• Fix the game loading in the wrong land
  
• No more falling through the land upon loading
  
• In the house creator, save the player's current position as spawn point
  
• Fix checks for whether furniture can be placed
  
• Make sure when loading, clothes go in the correct slots (no more wearing your pants as a hat)
  
• Prevent empty lobby names
  
• Make sure gates and return nodes show up at the right height
  
• No longer save items on a table or in a furnace twice