T30387 highlight_labels

Summary:
QmitkMultiLabelInspector set node property "org.mitk.multilabel.labels.highlighted" according to the mouse position in the tree view.

removed unnecessary Modified()

First draft for label highlight support in LabelSetImageVtkMapper2D

Fixed updating of lookup table in visibility functions of LabelSetImage

Ensure that lookup changes in MultiLabel model are propagated

simplified and streamlined LabelSetImageVtkMapper2D pipeline

Proper support of label highlights in context menus

Deactivate highlighting while opacity is changed in context menu

Optimized lookup table modification to speed up

(not iterating through all possible pixelvalue, but only
the one that are relevant.)

1st draft for simlpe 3D multi label segmentation mapper

Remove label highlighting if mouse is moved out of a cell into the uncovered background of the view.

Clean up MultiLabelSegmentationVtkMapper3D draft and 2D mapper

Adadpted Multilabel mapper to only process a group image if this group image has changed.

Reduced unnecessary mapper data generation

Only generate a new image slice if the plane geometry realy differs.

Fixed some errors in the 3D volume viz

Test Plan: code review, ui testing

Reviewers: O1 MITK Reviewer Group I, kislinsk

Reviewed By: O1 MITK Reviewer Group I, kislinsk

Subscribers: kislinsk, s434n

Differential Revision: https://phabricator.mitk.org/D922