Add CL version

[anon00000000]

Extremely slow, even with maximum optimization. As I'm a bit novice to CL, this may be my fault, but I doubt it, and SBCL storing Unicode text as array of codepoints instead of raw UTF-8 may be a culprit.

Redid PR without Tcl included, a bit new to the Github PR system.

[anon00000000]

Sample performance (vs Perl):

> sbcl --script common_lisp/benchmark.lisp input-text.txt
484.000 - 92
316.001 - 5301
411.999 - 5
> perl perl/benchmark.pl input-text.txt
87.682009 - 92
59.686184 - 5301
19.659042 - 5