If the user presses ESC in response to --more-- then automatically clear

all –more–s until the player can enter a command again, the player gets a prompt, or an error message is given.

Move where activity is interrupted on error messages, and also do that for error messages sent through formatted_mpr().

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7893 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on December 21, 2008
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