Remove the user data from the Lua function definition

include/openspace/scripting/lualibrary.h

@@ -47,8 +47,6 @@ struct LuaLibrary {
         std::string name;
         /// The function pointer that is executed if the function is called
         lua_CFunction function;
-        /// A vector of light userdata to be passed into the function
-        std::vector<void*> userdata;
         /// A text describing the arguments to this function
         std::string argumentText;
         /// A help text describing what the function does/