- handle special case of calling the function without wanting to delete anything
  (i.e. cound == 0)

Refactor grid item

See merge request !294

- delete dead code
- simplify existing code, e.g. by using Qt drawing utilities instead of our own

Resolve "Debug under MSVC linker Error"

Closes #225

See merge request !292

Since OpenCV is quite slow in debug, we always link against the release version. This does not work with MSVC due to incompatible crt's. Therefore, we don't do it on MSVC and have to live with the slowness...

Merge branch '227-add-script-which-checks-if-license-header-is-added-to-new-source-files' into 'master'

add script to check license header

Closes #227

See merge request !286

Add extra tab for trajectory tests

Closes #214

See merge request !141

Allows to display the result of the current plausibility checks, e.g., inside ROI at begin or end, short trajectories, equality to other person or fast velocity variations, in a table. Clicking on the table jumps to the person(s) and frame of the failed check. A color encoded column shows if the issue was already resolved. The color will be automatically adjusted when a person is changed.

Gray out calib 4

See merge request !284

- that means moving the widget and all its signal/slot connections
- Create new interface `WorldImageCorrespondence` for all calculations between image/pixel coords and world coords (dispatches to `ExtrCalibration` when 3D, else uses old 2D coord sys)
- Moves the methods for wold image correspondence from the `ImageItem` to the newly created `CoordinateSystemBox`
- During this change: Make the 2D coord system not depend on `mapToItem`; its now using normal affine transformations (`QTransform`) instead, which incidentally should make #383 easier
- `imageSizeChanged` is now a slot of `Control`, such that `ImageItem` can call it without having a reference to `Control` by sending a signal (Following that: image item is now now directly depending on control anymore)
- Some include clean-up

Resolve "Custom buttons in PMessageBox"

See merge request !290

Deleted unused class-member: camValues, distValues, isExtCalib

See merge request !282

Use not readable code marker for fixed head position

Closes #152

See merge request !278

Resolve "Time Offset direction"

Closes #400

See merge request !287

Resolve "Flaky MacOS test"

Closes #397

See merge request !289

Init reprojection error with 0

Replace TrackPerson inheritance with composition

See merge request !281

Remove the inheritance from `TrackPerson` in favor of composition, this allows a better handling of interactions with the `TrackPerson` as changes now go through defined interfaces.

Main changes:

* `TrackPerson` no longer **is** a `QList<TrackPoints>`
* `TrackPerson` now **has** a `QList<TrackPoints`
* new function `deleteFrameRange` which will delete a range of frames, but leaving no gaps in the middle
* `lastFrame` is now compute and not stored, hence no need to update it
* `firstFrame` is set when creating a `TrackPerson` and will be updated when needed automatically

Resolve "Transform  c3d file"

Closes #393

See merge request !283

Resolve "Ease usage of c3d visualization for time synchronization"

Closes #391

See merge request !279

fix: loop with different frameIn/frameOut

Closes #392

See merge request !280

Resolve "More clear error message: "Duplicate entry for markerID=...""

Closes #352

See merge request !276

changed File-Extension Check to be Qt::CaseInsensitive

Closes #317

See merge request !277

fix: wrong center after opening another project

Closes #387

See merge request !274

The image center (or principal point) could be set wrongly if the previous project had a significantly lower resolution, disallowing values for cx,cy such as the correct ones for the next project.

-> load video (and therefore imagesize) first

Resolve "Add tab where the logging output is displayed"

See merge request !233

Resolve "Make autosave parameters accessible via GUI"

Closes #336

See merge request !271

Context menu no longer moves the track point

Closes #386

See merge request !273