New `wcwidth()` implementation that uses a plain lookup table based on the unifont.hex file. Closes #591.
This allows use of all characters in the default unifont provided. I doubt there are any custom ones already anyway, but if there are, there is a small chance this will break some chars in those.
This also means that some characters that don't have an associated glyph now render (like 0x23FB), since unifont sneakily provides a small 'image' of the hexadecimal representation of those characters. Custom fonts will therefore also have to provide those as wide chars, but they don't have a reason to replace those anyway, because they're not defined, after all.
Added setting to allow disablng debug card functionality.
Added world getter to player values of debug card.