Add information in extension manager if composer mode is enabled
If you install TYPO3 with a composer.json, you should better not use the extension manager. To remind users, they are working with a composer installation, we should add a nice notification to extension manager.
[TASK] Add notification about composer mode
If the system was installed with composer, the user should better not
use the extension manager. This patch adds a notification to remind the
user that the system might break otherwise.
This is the first step before some extension manager functionality
will be disabled in the following TYPO3 version.
Reviewed-by: Helmut Hummel <email@example.com>
Tested-by: Helmut Hummel <firstname.lastname@example.org>
Reviewed-by: Benjamin Mack <email@example.com>
Tested-by: Benjamin Mack <firstname.lastname@example.org>