Support the silly way that ShoeBox saves its bmfont files

[MattRix]

ShoeBox saves the space character as a literal space " " instead of "space" (like every other BMFont tool does!), which means it breaks the FFont parser because the BMFont format is space-delimited.

See this for more info: http://www.reddit.com/r/futile/comments/22fiog/had_some_issues_using_shoebox_for_bitmap_fonts/

[evilzug]

haha, yay, that's my post! You rock!