Added add_glyph methods to formatted string to show a monster or item glyph as

displayed on screen. Still is a bit messy to use, and you must initialise the formatted_string with a base colour before using add_glyph(), or the formatted_string will reset to lightgrey after the glyph.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@897 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on January 28, 2007
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