Roslisp porting to ROS2

@prasenjitdan Sorry for the late response and thank you for offering to port roslisp to ROS2! We are currently not working on porting roslisp to ROS2. @kazhoyan@cs.uni-bremen.de What do you think?

Actually, I am surprised about your request. Why do you want to port roslisp to ROS2? We are using it in our research quite a lot, but are not clear on how to port it to ROS2. Does your team have experience with SBCL? How do you plan to approach the port?

Also, @dirk-thomas is a port of roslisp needed for ROS2?