Added DAOs
Finished entity types and DAO contexts.
Added database generation script.
Updated queries to simplify database interactions.
Removed junk that is no longer needed.
Updated database creation script.

Added sample content.
Merge branch 'feature/data-access-layer' of https://github.com/cphilippmueller/wfm-weplacm into feature/301-messagetype-communication

Inhaltliche Änderungen:
• 3 Ticket Start
o „Call Mail Application – deleted
o „Call Candidate DB – deleted
o Establish connection – connected with connector
o Conditions: added ;
• 5
o Call Candidate DB – deleted
o Umbenennung von „List of suitable candidates“ zu „List of Candidates to Propose”, nachdem der Background Check bestanden wurde
• 5b
o Rank Candidates macht der Recruiting Assistant (vorher: none)
o Trigger: zu manual geändert (Start durch Assistant)
• 8
o Synchronize activity entfernt
o 2 Ends hinzugefügt (laut Tutorial Videos kann ein Prozess mehrere Enden aber nu rein Anfang haben)