[!!!][TASK] Remove module URI storage in global variable

Previously the URI to a module which was dispatched through mod.php was stored
in a global variable $GLOBALS['MCONF']['_']

In terms of cleanup of global variable usage and
module configuration cleanup, this functionality is removed without substitution.

Instead BackendUtility::getModuleUrl() API must be used now.

Releases: master
Resolves: #65432
Change-Id: Iad436056e96d2334357320278cd8243f0f975538
Reviewed-on: http://review.typo3.org/37406


Reviewed-by: Michael Oehlhof <typo3@oehlhof.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>