docview: Now manages some images for RichTextView control.
docview: Now manages some images for RichTextView control.

The image list contains "missing image" images to indicate
where images where supposed to have been displayed.

wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI