Added an std::ostream, mpr_stream, to the message.h interface.

The usage is along the lines of: mpr_stream << setchan(MSGCH_PROMPT) << "this will be output to prompt" << i << "/" << j << std::endl; This is very hacky at the moment, but at least it's much more type-safe than mprf()…

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1389 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on April 28, 2007
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