WIP-commit
Implemented MessageSender and preliminary support for sending SMS (still untested)
Created separate SMS Gateway interface
Work in progress
Added missing @Version annotation
Added creation of default admin user
Introduced the concept of default roles.
Added password encoder
Simplified user handling again
wip
wip
Removed builders from Entity
Added exception classes
Fixed clone method
Added ContactService
Extracted interface from session info
Added fire department checks
Minor changes to Contact and ContactRepository
First version of ContactsView ready (validation is still missing)
Added ContactGroup entity + repo