some more load fixes

plugin related autoloading

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

do not autorequire class only libraries

those are loaded on demand through the autoloader mechanism

Also cliopts.php is not loaded automatically at all

first attempt to centralize all include loading

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

first attempt to centralize all include loading

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.

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