Add a setting to prevent locale_deploy from removing translations

Instead of composer.json you need to use composer.lock. That contains all installed modules. The json could only contain thunder/thunder-distribution.

I would assume, that composer.json would not be good enough to find all modules dependencies. We would propably need to look into the composer.lock file instead. But this seems to be to complicated.

In our use-case the option to disable the removal of translation files would be sufficient.

\Composer\InstalledVersions is actually what should be used :D

Thought about this some more. The composer inspection options will not work easily at all because module not always equal to project (think sub modules). Therefore this issue is going to add a setting to prevent deletes and put the management of removing translations in the user's hands.