[issue21933] Allow the user to change font sizes with the text pane of turtledemo

[Lita Cho]

Lita Cho added the comment:

I have  a version of this working with Ctrl-plus and Ctrl-minus. However, there is a bug with Tk 8.5.9 where binding to MouseWheel  crashes Tkinter for Macs (issue10731), which I am running into. I need to update Tkinter to see if this works.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21933>
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