Fourth pre-release patch

The following changes are now live:

• Fixed changed key mappings to save and load correctly
  
• Fixed steering menu option text flickering
  
• Fixed turnout building and removal in some cases (track layer should no longer go on an invalid switch and then derail)
  
• Added menu option to derail vehicles on foot (you can use this to "pause" an AI train for a minute)
  
• Added option to change rerailing to resetting (you can use this to reset your train if it's stuck but it also works on AI trains)