[FEATURE] Allow EXT: syntax in PageRenderer and Compressor

JS and CSS files can now be added via the EXT: syntax, to ease the
pain to a standardized way to include files with EXT: everywhere
now.

Resolves: #77589
Releases: master
Change-Id: Ie9de21cb5f9ea918f0ac069c83bc8020d11c299a
Reviewed-on: https://review.typo3.org/49491


Tested-by: Bamboo TYPO3com <info@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>
Reviewed-by: Philipp Gampe <philipp.gampe@typo3.org>
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>