Generalize camera selection

Src/Controller/ControllerMainWindow.cpp

Src/Controller/ControllerMainWindow.h

Src/Model/ImageStream.cpp

Src/Model/ImageStream.h

Src/View/CameraDevice.cpp

Src/View/CameraDevice.h

Src/View/MainWindow.h

Src/main.cpp

Src/util/camera/base.h

Src/util/types.h