DetectionSetttings window features

[Stephen Gatesy]

Seeing what the tracker is seeing is great, but to make full use of it for non-spherical markers it would be nice to compare detection methods (center of mass vs default x-ray marker would be of most use to us). Seeing how each of these change with threshold offset would be valuable. Naming the marker in the title bar or elsewhere would help too.

[Benjamin Knorlein]

add center mass and xray comparison always draw crosshair

[Benjamin Knorlein]

fixes #83 : Detection method can be changed in the detection settings dialog and a crosshair can be drawn on each image

→ <<cset 0dd43ea1e2d1>>