Merge pull request #528 from NicoleRauch/master

Waitinglist is now stored in each activity
migration script for moved waiting lists
resource must know its name to create proper waiting list entries
resourceName now field in WaitinglistEntry and parameter of constructor
removed ‚canSubscribe‘ from waitinglistAPI
small cleanup
adding to waiting list now redirects to login warning if not logged in
changed text in gdcr page
Merge pull request #529 from leider/master

minor cleanups for waiting list moved to resource
refactoring
resourceName changed back to method (was field)
extended migration script: now removing old „_withWaitinglist“
Merge pull request #530 from leider/master

Small refactorings & migration script extended