Allow "mute" as a colour in message_colour, which means the message

will be muted (duh.) message_colour can now override channel mutings (e.g., if you want to mute the pray channel except for a specific message.) Factored out some common code from {base,formatted}_mpr.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1211 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on April 4, 2007
2B4AQJIATJ4E7RFN6OTQITZNDBAPQ2VWWXLBCVYSORAFG2GIIDNQC
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