Support Unicode box-drawing symbols

[AlexKurisu]

Please, add support for using Unicode box-drawing symbols for player's pseudographics. Currently it's impossible to use them since ini parser ignores anything non-ASCII

[ruby-R53]

it's not really meant to be sophisticated, i don't think this will be accepted

[drfiemost]

That would require using wide chars on Windows, a quite invasive change.
Maybe a Unix only implementation to begin with...