[TASK] Move moduleLabels to ModuleLoader

Already translated module labels were previously resolved
and stored within $GLOBALS[LANG]. Several checks
and calls were then made to ModuleLoader and $LANG.

All information about the module, as well as all labels
are now stored within ModuleLoader, a addLabelsForModule()
method and a getLabelsForModule() method are placed within
that method, where labels are stored (but not resolved
to the language yet). The language service then is only used
when outputting the labels in various places.

The method $LANG->addModuleLabels() and the public
property $LANG->moduleLabels were deprecated.

Resolves: #72340
Releases: master
Change-Id: I82f01e7641b1395d81895d246ef22f11206d927d
Reviewed-on: https://review.typo3.org/46702


Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Andreas Wolf <andreas.wolf@typo3.org>
Tested-by: Andreas Wolf <andreas.wolf@typo3.org>