Added getWorldPropertiesValue(world, key)
Added getWorldPropertiesValue(world, key)

Wrapper for getPropertiesValue which expects a file path to
server.properties so worldname can be used to get a server.properties
value

seldonPlan/mscs,MinecraftServerControl/mscs,r15ch13/MinecraftServerControlScript,bot190/mscs,sandain/MinecraftServerControlScript