Patch v202410181647

This update fixes a few bugs and makes some minor changes:

• Add map and in-game markers for the source station of build contracts.
  
• Better scaling of build contracts. Longer contracts will be generated depending on how many main contracts have been completed, similar to the way delivery contracts scale.
  
• Stop the train driver drifting over time.
  
• Remove seams in skybox clouds.
  
• Smoother map lines for roads, tracks, etc.
  
• Fix a bug where unlocked structures were not saved for players who joined a host's game.
  
• Fix a bug where multiple tracks could be connected to the same monorail station.
  
• Fix a bug where "build monorail" contracts could be generated for monorail stations that were already connected.
  
• Fix robot spawn animation being in the wrong position.
  
• Fix monorail shunt sound playing when it shouldn't.