Recent development.
Revomed old callbacks and fields from tl_member using the old class "AvisotaDCA". See #167
Revmoved the mapping to integer for the mailling id, since the id is not an integer anymore. This also fixes #173
Added the mailing listst to the recipient palettes andupdates the callbacks. This should sollve #169
Fixed excpetion when creating a new recipient via BE
Adding Avisota mailing linsts to tl_member DCA (no save function yet)
Added save funcionality for mailings lists in tl_member
First refactored implementation of chained subscription managers.
Update fo the MemberSubscriptionManager
Forgotten files
Merge remote-tracking branch 'refs/remotes/github.com/develop' into develop

Conflicts:
	src/Avisota/Contao/DataContainer/Recipient.php
	src/Avisota/Contao/Subscription/RecipientSubscriptionManager.php
Rewrite the handling of recipients for the SubscriptionManagerChain
Update the handling of members
Recent development.
Recent development.
Remove dummy test code.
Merge remote-tracking branch 'davidmaack/develop' into develop
Recent development for Contao 3.
Prevent "Identifier X is not defined" error.
Move old files away.