Alpha 3 hotfix 3

A little more fixes. Thanks again everyone for reports!

[h3]Added:[/h3]

• Esc key now hides the construction menu and help window
  
• Post processing is now disabled for Intel GPUs by default
  

[h3]Fixed:[/h3]

• Crash when a builder has arrived on a finished construction
  
• All the workers stuck on the field are now free to go!
  
• Crash when everyone in town wants the same ox
  
• Some coastal areas had passable buildings/fences (will be fixed only for new games)
  
• Crash when putting down some buildings near water
  
• No ploughs being built if there's a wagon order in queue
  
• Crash after cancelling construction (in some cases)