Added common vector operations and tests.
Refactor picker to have common ancestor.
Provide the possibillity to clamp the values for closest points between two input points.
Make sure the landmark cannot go outside the volume.
Add transforms to render widget.
Lower the interaction rate so that the volume is better visible during free rotation.
Apply scale transfrom from free transform tool to moving render widget.
Add method for finding intersection of a line with triangle.
Add transformations property to projects.
Add a python wrapper for vtkTransforms.
Do imports properly for classes in core.
Do imports properly for classes in ui.
Make sure that the property widgets below can increase vertical size.
Improve toolbar by showing description beneath icons and pin it to the top.