members now can be renamed + changed the way UNIQUE checks work

Implementace/controllers/group_edit_controller.py

Implementace/controllers/member_overview.py

Implementace/database.py

Implementace/database_create.py

Implementace/main.py

Implementace/model/group.py

Implementace/model/member.py

Implementace/utils/members_drag_drop_table.py

Implementace/windows/groupedit.py

Implementace/windows/mainwindow.py

Implementace/windows/qt/groupedit.ui

Implementace/windows/qt/mainwindow.ui

Implementace/windows/qt/qt.pro