FS#923 Add code cache cleaning to exe/indexer.php

Syntax

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  2006-09-26 ChrisS

  (this is sort of a self reminder)
  
  It would be handy to add a lowest priority function to bin/indexer.php to clean out old .code cache files. These are the cache GeSHi code fragments from pages.  The cache files are touched to refresh them whenever a page is rendered, so it should be safe to remove files that are say 90 days old.
  
  
  
  
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  2013-08-04 ChrisS

  I tend to think this is better handled by system/cron/find rather than indexer.  disk space is cheap and plentiful, plus to search for these files and find none requires reading the entire cache, each and everytime.
  
  
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  2014-02-16 ChrisS

  Addressed by PR#551 - https://github.com/splitbrain/dokuwiki/pull/551
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  2014-02-16 ChrisS

  see https://www.dokuwiki.org/plugin:cleanup