This option (in config section) forced composer to create
optimized autoloader.

This improves speed but has some disadvantages:
- creating optimized autoloader takes longer
- no possibility exists to deactivate optimized autoloader
  from CLI, once it's set in composer.json config section

After this patch is applied, deployment servers need to call
composer install with -o flag, in order to enable optimized
autoloader.

Releases: master
Resolves: #81868
Change-Id: I45321500353d34d6b63813473262b4cc1dd2036d
Reviewed-on: https://review.typo3.org/53475


Reviewed-by: Helmut Hummel <typo3@helhum.io>
Tested-by: Helmut Hummel <typo3@helhum.io>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Benjamin Kluge <b.kluge@neusta.de>
Tested-by: Benjamin Kluge <b.kluge@neusta.de>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>