This makes it possible to autoload the sitemapper when needed.

This patch adds an option to choose how filenames are encoded
when saved to the file system. You can choose between urlencoding
(url), the new SafeFn method (safe) and storing real UTF-8 (utf-8).

This patch moved the place where DOKU_PLUGIN is defined. It no longer
can be set from a normal config (only via preload)

those are loaded on demand through the autoloader mechanism

Also cliopts.php is not loaded automatically at all

Classes are loaded throug PHP5's class autoloader, all other
includes are just loaded by default. This skips a lot of
require_once calls.

Parser and Plugin stuff isn't handled by the class loader yet.