[CM] clm under cmucl-18e

[Bob Coyne]

I downloaded clm and tried it under cmucl-18e on Linux.  I encountered
a few small problems that seem worth reporting:

1. It calls (load-foreign ...).  Needs to be (ext:load-foreign ...)

2. Various instrument files don't have (in-package :clm) at the top.

3. (with-sound ...) failed when lisp invoked a shell command "sndplay <file>".
I fixed it by setting *clm-player* explicitly.  I guess I could/should change my search
path.  (I didn't see any instructions saying I needed to do that.)

- Bob