0.98.5

1. Support to set font for all boxes
   There are 2 types font to set , one for text and one for buttons, if the font is not set, then use the default font.

• Usage 1: set text font

  import easygui as eg
  
  eg.EgFont.text_font_name = "微软雅黑"
  eg.EgFont.text_font_size = 12
  eg.msgbox("Hello World! 你好！", "Title")

• Usage 2: set buttons font

  import easygui as eg
  
  eg.EgFont.button_font_name = "MS Serif"
  eg.EgFont.button_font_size = 11
  eg.EgFont.button_font_style = "italic"
  eg.EgFont.button_font_slant = "normal"
  eg.msgbox("Hello World! 你好！", "Title")