Provided Icon for new SimObjs: Power Plant Diversion and Generator
Bug Number: n/a
Release notes (y/n): no, not this detail
For Release Nums: 7.2

See new icon -- used for both new SimObj types:

  http://cadswes2.colorado.edu/~philw/2017/Icons/PowerPlantDiv/icon.html
  RiverWare Source: QtUtils\Images\RwQtIcons\PowerPlantDiversion.png

Special handling in method: const QPixmap& RwGraphicsScene::selectSimObjIcon().
On the RiverWare workspace, selected object icons are indicated with a black
square background.  Since this is a (virtually) all black icon, it was showing
up as just a black square when the icon was selected.  For this particular
icon, we INVERT THE COLORS before laying it on top of a black square
background.  (This is done quick and dirty -- a special case for the Power
Plant Diversion and Generator SimObj type in the RwGraphicsScene class,
which shouldn't generally have special cases for particular object types).
(That's OK).

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