add 'DmCommon\View\Helper\UserText' with pointer to DmMailerdmin Factory

this feels as a strange workaround right now - should be better way to solve the problem as I did to get things running.

After installing a fresh copy of dermailer and without data inside the db, I got many exceptions calling for 'DmCommon\View\Helper\UserText' [the tinyMce Module Factory\Controller\Message was causing the exception]. 

With data inside and without my "fix" I now get:

```Catchable fatal error: Argument 4 passed to DmMailerAdmin\Controller\CampaignController::__construct() must be an instance of DmCommon\View\Helper\UserText, instance of DmCommon\Service\ErrorHandler given, called in /Sites/_git/dermailer/vendor/peteraba/dm-tinymce/src/DmTinymce/Factory/Controller/Campaign.php on line 49 and defined in /Sites/_git/dermailer/vendor/peteraba/dm-maileradmin/src/DmMailerAdmin/Controller/CampaignController.php on line 57```

This userText view plugin is used by different modules through different factories - so I assume it gets called through code before view layer? So perhaps it is more then a view helper? Did not dive into code to understand it well. Perhaps you can give short description, how this setup is intended? So, perhaps I can provide a better fix for my problems with that plugin.

Regards


So actually DmMailerAdmin and DmCommons are both requirements of DmTinymce and therefore  it should be okay to put this code into dm-maileradmin. I'll do the fix now.