0029018: Documentation - Provide user guide for Qt browser

Documentation is added in a new "Inspector" page of "User Guides".
Inspector plugins has some improvements by the documentation needs.
New DRAW scripts are implemented for 'tinspector' command.

tools/DFBrowser/DFBrowser_SearchLine.cxx

@@ -65,8 +65,7 @@ public:
     QRect aLineRect = rect();
     Qt::Alignment anAlignment = QStyle::visualAlignment (layoutDirection(), Qt::AlignLeft);
 
-    QColor aColor = palette().text().color();
-    aColor.setAlpha (128);
+    QColor aColor = Qt::gray;
     QPen anOldpen = aPainter.pen();
     aPainter.setPen (aColor);
     aLineRect.adjust (4, 4, 0, 0);