Object Viewer: Revised Object Tab Icons
Bug Number: n/a
Release notes (y/n): no
For Release Nums: 7.1

Four different variations of Object Tab Icons in the Object Viewer's object 
tabs are illustrated on this webpage:

 http://cadswes2.colorado.edu/~philw/2017/BorLc7-Win/2017-05-15/TabOptions.html
 http://cadswes2.colorado.edu/~philw/2017/BorLc7-Win/2017-05-15/TabSpacing-FourDetails.png
 http://cadswes2.colorado.edu/~philw/2017/BorLc7-Win/2017-05-15/TabSpacing-FourFrames.gif

(1) Object Icon    / Default Close Button (RED) -- Yesterday's Commit
(2) No Object Icon / Default Close Button (RED)
(3) No Object Icon / Custom Close Button -- *** THIS COMMIT ***
(4) Object Icon    / Custom Close Button

When the Object Icon is shown, the GAP between the tab's icons and text is 
undersirably wide. I couldn't find a way to reduce that gap.  Conversely, 
NOT showing the object icon reduces the gap between the text and the close 
button.

Whether or not Object Icons are shown is determined with this symbol
(in Q3GUI/OpenObjectDlg.cpp):

   static const bool VIEWER_TABS_SHOW_OBJ_ICONS (false); // 7.1: false

The custom close button is specified in this stanza in the TabStyleStr
definition:

   "QTabBar::close-button {\n"
   " image: url(:/RwQPixmap11/closeX)\n"
   "}\n"

See the currently available icons (alternatives to "RwQPixmap11/closeX"
specified above) on these webpages:

   http://cadswes2.colorado.edu/~philw/2016/RiverWareIcons2/RwQPixmap11.html
   http://cadswes2.colorado.edu/~philw/2016/RiverWareIcons2/index.html

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