Name
  font:GetUnicodeWidth -- get Unicode character width
Synopsis

      w = font:GetUnicodeWidth(code)

Function
  `font:GetUnicodeWidth()` gets the width of a Unicode character in a specific font. The actual width of the character on the page can be calculated as follows:

      char_width = font:GetUnicodeWidth(font, UNICODE)
      actual_width = char_width * FONT_SIZE / 1000

  Returns character width on success. Otherwise, returns `Nil`.

Inputs
  code
    a Unicode character
Results
  w
    Unicode character width

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