tables separated to classes just handling them

Implementace/controllers/group_edit_controller.py

Implementace/controllers/groups_overview_controller.py

Implementace/controllers/mainwindow_controller.py

Implementace/database.py

Implementace/model/group.py

Implementace/model/qtmodels/person_table_model.py

Implementace/utils/group_table.py

Implementace/utils/person_table.py

Implementace/windows/groupedit.py

Implementace/windows/groupsoverview.py

Implementace/windows/grouptable.py

Implementace/windows/qt/groupoverview.ui

Implementace/windows/qt/qt.pro

Implementace/windows/qt/qt.pro.user