Added AES encryption module.
Added merlin/utils/ActiveUserData.java which shall contain user specific data during the session, such as user id, name, email, etc.
Added ExitCode.java and SaveExitDialog.java for proper exiting from dialogues.
Updated ExitCode.java adding new states.
Changed return value of DatabaseSetup to ExitCode to make reason for dialog quitting recognizable to the calling parent of the dialog.
Finished GUI design. Logical implementations remaining unfinished. Following up in upcoming merlin/logic package.

Changed return value of MerlinLogin to ExitCode.
Updated ExitCode.java.

Minor update on MerlinMain.java.

Calling minimal dialog sequence in Main.java, using ExitCode return values.