[Qt-creator] Recognizing .C / .H file extensions as C++

[Pablo Mejia]

Thanks for the first Linux IDE to make me think about switching from 
emacs (still need keybindings though).  However, I have a minor but 
fatal problem.

I have a lot of C++ source that uses .C (and .H file) extensions and 
creator treats them as text files instead of as C++ source.  Renaming 
them isn't an option, so Qt Creator isn't really usable.

I really love the code completion, so it would be really nice if this 
was fixed.  The ideal fix would include an option to treat .c/.h as C++ 
source as well (for when you have to use broken file systems).

Thanks, Pablo