[TASK] Deprecate $GLOBALS['TYPO3_LOADED_EXT']

$GLOBALS['TYPO3_LOADED_EXT'] is defined as the "old" way
since the introduction of the PackageManager in 2013:
https://review.typo3.org/19605
(The class description of LoadExtensionArrayElement states:
Class to simulate the "old" extension information array element)

This old way should finally be removed to reduce site effects
(pollution of the global scope) of the PackageManager class.
It's marked as deprecated now, to be removed in v10.

All existing usaged are rewritten to use the PackageManager API.

Releases: master
Resolves: #86404
Change-Id: Ic53f5155828ef2ea711a1961e08f8e020e3f836a
Reviewed-on: https://review.typo3.org/58408


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>