[todo] Added a checkbox "Low case filenames" in the new class wizard

[Emmanuel BOURGERIE]

Hello !

This is my first patch, tell me if I did something wrong ;)

I added the possibility to choice between a low-case filename or not when  
creating a new class.
Example :
The Apple class can be written :
  - apple.cpp and apple.h
  - Apple.cpp and Apple.h

Just with a checkbox. The two attachments contain the diff files and the  
affected files.
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