message: add more keyboard shortcuts to menu text
diff: @@ -463,7 +463,7 @@ namespace ospray {
  ImGui::Separator();
  bool paused = renderingPaused;
  - if (ImGui::Checkbox("Pause Rendering", &paused))
  + if (ImGui::Checkbox("(R) Pause Rendering", &paused))
  toggleRenderingPaused();
  auto setFrameAccumulation = [&]() {
  @@ -612,23 +612,23 @@ namespace ospray {
  void MainWindow::guiMainMenuCamera()
  {
  if (ImGui::BeginMenu("Camera")) {
  - ImGui::Checkbox("Auto-Rotate", &animating);
  + ImGui::Checkbox("(A) Auto-Rotate", &animating);
  ImGui::Separator();
  bool orbitMode = (manipulator == inspectCenterManipulator.get());
  bool flyMode = (manipulator == moveModeManipulator.get());
  - if (ImGui::Checkbox("Orbit Camera Mode", &orbitMode))
  + if (ImGui::Checkbox("(I) Orbit Camera Mode", &orbitMode))
  manipulator = inspectCenterManipulator.get();
  if (orbitMode)
  ImGui::Checkbox("Anchor 'Up' Direction", &upAnchored);
  - if (ImGui::Checkbox("Fly Camera Mode", &flyMode))
  + if (ImGui::Checkbox("(F) Fly Camera Mode", &flyMode))
  manipulator = moveModeManipulator.get();
  - if (ImGui::MenuItem("Reset View"))
  + if (ImGui::MenuItem("(r) Reset View"))
  resetView();
  if (ImGui::MenuItem("Create Default View"))
  resetDefaultView();
  @@ -647,9 +647,9 @@ namespace ospray {
  ImGui::Separator();
  - if (ImGui::MenuItem("Reset Accumulation"))
  + if (ImGui::MenuItem("(c) Reset Accumulation"))
  viewPort.modified = true;
  - if (ImGui::MenuItem("Print View"))
  + if (ImGui::MenuItem("(p) Print View"))
  printViewport();
  ImGui::InputFloat("Motion Speed", &motionSpeed);
  