0003043: Shop/portal mimics change into "ASCII characters" when revealed (using DEC character set)

Notes
(0009890) Kate (developer) 2010-12-25 21:32	See also 0002781 (which was closed for some reason).

(0009891) due (developer) 2010-12-25 23:46	It got closed because the comments veered wildly off thread and into "ew feature mimic" territory. It's on my list of things to do, however!

(0009892) due (developer) 2010-12-26 00:47	commit ce45d4ab1797492fe143a8663235d58a605e63d5 Author: Jude Brown <bookofjude@users.sourceforge.net> Date: Sun Dec 26 09:44:16 2010 +1000 Resolve 0003043: feature mimic glyph changes. The bug reported was in Unicode, but this applies even to ASCII. For example, up stair mimics ("<") would, upon becoming known, instantly change glyph to down stair mimics (">"). I partially resolved this by setting colours. This commit should hopefully fix everything else, as it specifically fetches the feature definition for the feature being mimicked, and consistently returns that both when known and unknown. The only difference know is that one is identified as a monster, and the other not. Need to double check tiles, also.