Merge pull request Kitware#702 from Kitware/pwf_setnodes

fix(PiecewiseFunction): Add setNodes() to API

Merge pull request Kitware#698 from Kitware/pwfproxy_modes

PiecewiseFunctionProxy modes

Merge pull request Kitware#701 from Kitware/duh_add_radial

fix(Rendering): add missing class

Merge pull request Kitware#699 from Kitware/add_radial_distortion_pass

fix(Rendering): add distortion pass, fix sizing, skybox

Merge pull request Kitware#695 from Kitware/fix-device-pixel-ratio

Fix device pixel ratio

Merge pull request Kitware#690 from Kitware/improvements

Improvements

Merge pull request Kitware#688 from Kitware/color_presets

Support adding and removing colormap presets

Merge pull request Kitware#685 from Kitware/skybox_timer

fix(Rendering): add timer for skybox app

Merge pull request Kitware#677 from Kitware/fix_annotated_cube_actor

fix(AnnotatedCubeActor): Vertically flip face textures

Merge pull request Kitware#674 from luciemac/addKeyDownEvent

fix(RenderWindowInteractor): handle keydown event