0.40 beta quality

• many scripts will now work in multiple worlds (note: getHeight() only works in the first world, the overworld)
• experimental client-only read-only mode where changes do not get saved to the world; you can run scripts in this mode locally even while connected to a remote server--the changes will only show up on your screen
• support for server-side modding (need to have the Forge and Raspberry Jam Mod installed on both server and client)
• scan.py script
• enhancements to vehicle.py and other scripts