This also
+ makes highlighting more robust against unreported
  (i.e., buggy Qt) "leave" events (by also resetting the hover
  selection when the mouse leaves the resource panel dock widget).
+ draws a background on Qt items as the mouse hovers over them
  (when highlight-on-hover is set) so that users get feedback on
  when Qt has skipped events.
+ fixes transforms applied to the representation; previously,
  transforms were not applied to selected/highlighted components.
+ fixes the build against latest ParaView master.
  The old `WRAP_EXCLUDE` and `WRAP_EXCLUDE_PYTHON` CMake source
  properties are no longer used; classes must pay attention to
  the `__VTK_WRAP__` macro to exclude themselves if needed.
+ adds user preferences for selection/hover colors and a default
  model-face color (for model edges, we should use ParaView's
  existing edge color).
  Thanks to Utkarsh for explaining the `<Extension ...>`
  element in PV's SM XML.
+ fixes the "can't deselect" bug (the SMTK model-representation's
  actors/mappers were not being updated when no entities were selected).