* examples/book/drawingarea/image/fractal_image.png:
* examples/book/drawingarea/image/main.cc:
* examples/book/drawingarea/image/myarea.[h|cc]: New example.
* examples/Makefile.am: Mention the new files.
* examples/.gitignore: Ignore the executable file drawingareaimage.
* docs/tutorial/C/figures/drawingarea_image.png: New screenshot.
* docs/tutorial/Makefile.am: Mention the new file.
* docs/tutorial/C/gtkmm-tutorial-in.xml: Replace all talk about the removed
classes Gdk::Bitmap and Pixmap by Pixbuf. Update the Drawing Images section
in the Drawing Area Widget chapter to gtkmm3 status. Remove removed and
deprecated classes from the list in the Widgets Without X-Windows chapter.
Bug #658265.