#5 Implement DISPATCH macro

[Victor Anyakin]

Implement DISPATCH macro to provide a convenient way to utilize performance gains offered by Aho-Corasic, Commentz-Walter and other algorithms with finite set of patterns.

This macro will have an API similar to the CASE macros family:

:::lisp
(sm:dispatch (line :start 10)
  ("syslogd"
     (process-syslog-message line))
  ("kernel"
     (process-kernel-message line))
  ((or "sendmail"
       "qmail")
     (process-mailer-message line))
  (t
     (process-generic-message line)))

This will likely require compiling clause forms into lambdas and attaching them to the associated keywords in the index.

[Victor Anyakin]

Select-Match macro from the Miranda package might serve as an inspiration.