We no longer truncate lines if there's a character which
can't be coded for in unicode, which stops lots of other
breakage.

Change-Id: I1886703fc7f6e4d2076da4e4bd3b9aa60e8bc051
Fixes-Issue: CLIENT-353
Reviewed-on: http://gerrit.dmdirc.com/2414
Reviewed-by: Shane Mc Cormack <shane@dmdirc.com>
Automatic-Compile: DMDirc Build Manager