Implement "pointer" and related figure properties for Qt toolkit (bug #56347) * genpropdoc.m: Document "pointer", "pointershapecdata" and "pointershapehotspot" properties. * libgui/src/icons, libgui/src/module.mk, libgui/src/resource.qrc: Add new cursor png images extracted from the standard DMZ theme. Also add circle.png/svg designed to look like DMZ icons. * Canvas.[h, cc] (Canvas::setCursor): Change signature to include, pointer name, cdata and hotspot location. Use Qt standard QCursors for "arrow", "ibeam", and "watch" cursors. Use DMZ theme cursors for others. Build QCursor from Qimage for "custom" pointers. * Figure.[h,cc](m_pointer_cdata): New QImage data member. (pointer_to_qimage): New static function to convert from Matrix to QImage. (Figure::update): Call Canvas::setCursor whenever "pointer" or "pointershapehotspot" is updated. Refresh m_pointer_cdata when updating "pointershapecdata" and eventually call Canvas::setCursor. * graphics.in.h(figure::properties::pointershapecdata): Use 1 as default value for all pixels.

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