added some icons

Implementace/controllers/group_edit_controller.py

Implementace/controllers/groups_overview_controller.py

Implementace/controllers/mainwindow_controller.py

Implementace/resources/icons/back.svg

Implementace/resources/icons/edit.svg

Implementace/resources/icons/minus.svg

Implementace/resources/icons/ok.svg

Implementace/resources/icons/plus.svg

Implementace/resources/resources.qrc

Implementace/resources_rc.py

Implementace/utils/editable_title_widget.py

Implementace/utils/members_drag_drop_table.py

Implementace/windows/distributionsetup.py

Implementace/windows/editable_title.py

Implementace/windows/groupedit.py

Implementace/windows/mainwindow.py

Implementace/windows/qt/distributionsetup.ui

Implementace/windows/qt/editabletitle.ui

Implementace/windows/qt/groupedit.ui

Implementace/windows/qt/mainwindow.ui