improve UTF8 suport on Ruby/Tk

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Hi, 

If you are interested in the following ChangeLog, please try it. 

------<ChangeLog>-----------------------------
Thu Oct 16 16:40:51 2003  Hidetoshi NAGAI  <nagai / ai.kyutech.ac.jp>

        * ext/tk/lib/tk.rb: 
          Add Tk::EncodedString and Tk::UTF8_String class to support 
          characters using the \uXXXX escape to the UNICODE string.

        * ext/tk/sample/{demos-en,demos-jp}/unicodeout.rb
          new demo-scripts (samples of Tk::UTF8_String)

        * ext/tk/sample/{demos-en,demos-jp}/widget
          add entries for 'unicodeout.rb'
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                                         永井 秀利 （九工大 知能情報）
                                             nagai / ai.kyutech.ac.jp