Patch 2

Patch 2 is now live with the following changes:

• Fixed crash when unlocking the mouse pointer and exiting the track layer by using mouse scroll wheel on "hop off"
  
• Fixed turnout building when unlocking the mouse pointer and clicking on "build turnout"
  
• Fixed key mapping to recognise modifier keys (shift, alt, ctrl) and combinations of such keys
  
• Added settings option to restore default keys