Yet another change to monster speech and silencing...

I found my previous change to block all messages passed through MSGCH_TALK when silenced was too restrictive, so I've added another channel MSGCH_TALK_VISUAL and adapted the monster speech files accordingly. For example, imps can now also "talk" when silenced, but only the visual stuff will actually be output. (This automatically takes care of lowering the output likelihood.) And no, this doesn't hurt any, as visual talk also won't interrupt travel or resting.

And I added a how-to file on monster speech, which was the main reason for my silence during the last couple of hours. It's not that the database system is that complicated but it surely can't hurt to give players who want to add something an idea of what is possible and how to go about it.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2108 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on September 16, 2007
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