- add preview/live update to TaskSectionView & TaskComplexSection
- add view direction selector to uis
- use SectionNormal as Direction. Make Direction read-only
- simplify section line end point calculation
- section group command in toolbar
- make section and complex section icons consistent
- fix compsolid cutting tool
- terminology: single/piecewise to offset/aligned
- replace use uniformly Gui::QuantitySpinBox
- fix and uniform size of all objects in the dialog
- apply changes immediately once the section is created because this speeds up the workflow a lot, especially for when changing the plane position
- some code cleanup: remove unused void, avoid unused variables
