New gameplay

The new loan mechanic creates a new interesting way to play the game, taking a loan on a good deal can now create steady income. Because of the loans you start with less money and have to make smarter choices to make a profit.

New things:

• Added loan mechanic
  
• New building upgrade menu
  
• Added mouse controls
  

Fixes:

• Decreased starting money
  
• Rebalanced rent income
  
• click on buildings in the list to jump to them