anchor: Font:getKerning
  Gets the kerning between two characters in the Font.
  
  Kerning is normally handled automatically in love.graphics.print, Text objects, Font:getWidth, Font:getWrap, etc. This function is useful when stitching text together manually.
  kerning = Font:getKerning( leftchar, rightchar )
  leftchar string The left character.
  rightchar string The right character.
  kerning number The kerning amount to add to the spacing between the two characters. May be negative.
  kerning = Font:getKerning( leftglyph, rightglyph )
  leftglyph number The unicode number for the left glyph.
  rightglyph number The unicode number for the right glyph.
  kerning number The kerning amount to add to the spacing between the two characters. May be negative.