aruco: show FPS and spacing

Signed-off-by: Stanislaw Halik <sthalik@misaki.pl>
aruco: show reprojection

Signed-off-by: Stanislaw Halik <sthalik@misaki.pl>
aruco: show reprojection error

Signed-off-by: Stanislaw Halik <sthalik@misaki.pl>
ar: gauss kernel 7 -> 5 (callgrind)

Signed-off-by: Stanislaw Halik <sthalik@misaki.pl>
accela: ui broke with runtime dpi changes. fix it.

Signed-off-by: Stanislaw Halik <sthalik@misaki.pl>
accela: sadly, change scaling coefficient

Signed-off-by: Stanislaw Halik <sthalik@misaki.pl>
ar: use pre-computed gaussian kernel for 20% speed increase

Signed-off-by: Stanislaw Halik <sthalik@misaki.pl>
Merge branch 'master' of github.com:opentrack/opentrack