Add option to export the view via CLI

Adds the option autoExportView|-autoexportview outputFile to PeTrack, such that the view, e.g., the undistorted can be exported directly via CLI.

Example execution:

petrack -project project.pet -autoExportView exported_view.avi

Note: _When testing, use a small video file, as currently the avi file get quite large! Will be solved in #246 (closed) _

Closes #245 (closed)