Add support for several Common Lisp implementations.

I added support for several Common Lisp implementations.

I know Clisp is already in the menu, but it isn't the most popular implementation. This patch adds the below CL implementations.

- Clozure CL
- SBCL
- Allegro CL
- ABCL
- CMUCL
- ECL

I added Clisp to "Common Lisp" as a child element, so I think "Clisp" isn't needed anymore.