Use modern OpenGL in renderers

[smistad]

• [ ] Decide whether to simply remove volume/image transforms when doing 2D
• [x] Remove viewing plane functionality on view. Use ImageSlicer instead.
• [x] Implement zoom functionality in 2D using mouse wheel
• [x] Fix ImageSlicer
• [x] ImageSlicer, BinaryThresholding etc. always re-executes. ImageFIleImporter?
• [x] Reset camera
• [x] Unable to always stop renderers
• [x] LineRenderer in 2D
• [x] VertexRenderer in 2D
• [ ] TriangleRenderer in 2D
• [x] SegmentationRenderer with modern GL
• [x] HeatmapRenderer
• [x] TextRenderer
• [ ] BoundingBoxRenderer